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Cheap flights from Ontario (ONT) to Heathrow (LHR) from $371

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/15. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — LHR
Jun 10 — Jun 171
From?
To?
Mon 6/10
Mon 6/17
1 adult, Economy
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The best prices from Ontario to London Heathrow are usually found in April or December, booked 27 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

Cheap flight deals from Ontario to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 5, 2024.

Popular in

July

Cheapest in

April

Round-trip from

$643

One-way from

$434
High demand for flights, 26% potential price rise
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Best time to find cheap flights, 13% potential price drop
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From Ontario to London Heathrow
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One-way flight from Ontario to London Heathrow
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What is the cheapest day to fly round-trip from Ontario to London Heathrow Airport?

Sunday flights are generally found to be more expensive for flights from Ontario to London Heathrow Airport. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London Heathrow Airport.

How far in advance should I book a flight from Ontario to London Heathrow Airport?

Find a great deal and save up to 27% by booking at least 15 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Ontario to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at $760.

What is the cheapest month to fly from Ontario to London Heathrow Airport?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, October can be a great choice for travel to London Heathrow Airport. Flights to London Heathrow Airport from Ontario in October are about $714 on average during October, but can be found for as low as $433.

What is the cheapest time of day to fly from ONT to LHR?

It’s typically best to fly out from Ontario to London Heathrow Airport in the morning. Doing so could potentially save you 31% on the flight price compared to flying in the evening, which is usually more expensive.

Cheap Ontario to Heathrow flights in June & July 2024

Find cheap flight options from Ontario to Heathrow specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,050,429 searches. Prices were last updated on June 5, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to London in 2024. For more flight deals, be sure to check back very soon.
Sat 7/2711:59 pmONT - LHR
1 stop22h 26mAmerican Airlines
Tue 8/271:05 pmLHR - ONT
1 stop17h 22mAmerican Airlines
Deal found 6/3$587
Wed 7/3110:48 amONT - LHR
1 stop13h 12mIberia
Tue 8/2712:00 pmLHR - ONT
1 stop14h 48mIberia
Deal found 6/4$589
Wed 7/3110:48 amONT - LHR
1 stop13h 12mIberia
Tue 8/2712:00 pmLHR - ONT
1 stop14h 48mIberia
Deal found 6/5$590
Wed 7/171:21 pmONT - LHR
1 stop12h 39mKLM
Fri 1/312:30 pmLHR - ONT
1 stop16h 28mKLM
Deal found 6/4$618
Wed 7/311:45 pmONT - LHR
2 stops14h 35mUnited Airlines
Tue 8/272:50 pmLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 6/4$629
Wed 7/311:45 pmONT - LHR
2 stops14h 35mUnited Airlines
Thu 8/222:50 pmLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 6/4$635
Sat 7/271:45 pmONT - LHR
2 stops38h 05mAir Canada
Tue 8/272:05 pmLHR - ONT
2 stops30h 27mAir Canada
Deal found 6/3$637
Sun 7/71:30 pmONT - LHR
1 stop14h 50mUnited Airlines
Fri 8/3011:05 amLHR - ONT
1 stop14h 17mUnited Airlines
Deal found 6/4$638
Sat 7/2712:43 pmONT - LHR
2 stops15h 27mAmerican Airlines
Tue 8/279:45 amLHR - ONT
1 stop14h 23mAmerican Airlines
Deal found 6/3$642

Ontario to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 5, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to London in 2024. For more flight deals, be sure to check back very soon.
Tue 10/18:10 amONT - LHR
1 stop15h 50mBritish Airways
Tue 10/156:55 amLHR - ONT
2 stops22h 47mBritish Airways
Deal found 6/3$544
Tue 10/15:53 pmONT - LHR
1 stop12h 57mDelta
Tue 10/86:15 amLHR - ONT
2 stops18h 53mDelta
Deal found 6/5$556
Tue 10/297:45 amONT - LHR
1 stop20h 55mDelta
Fri 11/88:40 amLHR - ONT
2 stops20h 30mDelta
Deal found 6/4$558
Tue 10/15:00 pmONT - LHR
2 stops19h 10mDelta
Tue 10/86:15 amLHR - ONT
2 stops18h 53mDelta
Deal found 6/5$560
Tue 10/291:42 pmONT - LHR
1 stop13h 18mDelta
Fri 11/811:35 amLHR - ONT
1 stop18h 54mDelta
Deal found 6/4$562
Wed 10/166:32 amONT - LHR
1 stop15h 53mBritish Airways
Wed 10/238:40 amLHR - ONT
1 stop16h 53mBritish Airways
Deal found 6/4$563
Tue 10/112:47 pmONT - LHR
2 stops15h 28mAmerican Airlines
Tue 10/151:40 pmLHR - ONT
2 stops16h 04mAmerican Airlines
Deal found 6/3$567
Sat 11/95:50 pmONT - LHR
1 stop30h 55mDelta
Tue 11/2611:35 amLHR - ONT
1 stop18h 54mDelta
Deal found 6/4$568
Mon 9/306:10 amONT - LHR
1 stop17h 50mBritish Airways
Mon 10/77:15 pmLHR - ONT
2 stops34h 27mBritish Airways
Deal found 6/4$572

Ontario to Heathrow flights leaving soon

Find last-minute flight options from Ontario to Heathrow for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 5, 2024.
Have a look at some of the flights available from Ontario to London departing last-minute. Tip: verify your flight details before completing your reservation.
Wed 6/121:29 pmONT - LHR
1 stop14h 51mUnited Airlines
Wed 6/194:15 pmLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 6/5$844
Mon 6/102:44 pmONT - LHR
1 stop14h 01mIberia
Mon 6/1711:30 amLHR - ONT
2 stops20h 29mIberia
Deal found 6/3$878
Wed 6/121:29 pmONT - LHR
1 stop14h 51mUnited Airlines
Mon 6/1711:05 amLHR - ONT
1 stop14h 23mUnited Airlines
Deal found 6/3$893
Mon 6/106:25 pmONT - LHR
2 stops33h 25mAir Canada
Mon 6/179:30 amLHR - ONT
2 stops43h 18mAir Canada
Deal found 6/3$899
Wed 6/121:25 pmONT - LHR
1 stop12h 35mKLM
Thu 6/2010:55 amLHR - ONT
1 stop13h 21mKLM
Deal found 6/3$937
Tue 6/115:15 amONT - LHR
2 stops18h 00mUnited Airlines
Fri 6/2810:25 amLHR - ONT
1 stop20h 20mUnited Airlines
Deal found 6/4$1,019
Tue 6/116:25 pmONT - LHR
1 stop33h 55mUnited Airlines
Fri 6/2810:25 amLHR - ONT
1 stop20h 20mUnited Airlines
Deal found 6/4$1,022
Tue 6/112:44 pmONT - LHR
1 stop14h 01mFinnair
Fri 6/1412:00 pmLHR - ONT
1 stop14h 57mFinnair
Deal found 6/4$1,038
Tue 6/116:00 amONT - LHR
1 stop17h 40mUnited Airlines
Tue 6/182:50 pmLHR - ONT
1 stop13h 58mUnited Airlines
Deal found 6/4$1,044

One-way flights to Heathrow from Ontario

Search for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 5, 2024.
Users in need of a one-way flight from Ontario to London can choose from these deals. Users in need of a round-trip flight from Ontario to London instead should update the search form at the top of page.
Mon 7/1512:49 amONT - LHR
3 stops48h 36mMultiple Airlines
Deal found 6/4$371
Tue 7/168:27 amONT - LHR
3 stops40h 58mMultiple Airlines
Deal found 6/4$387
Wed 10/22:44 pmONT - LHR
1 stop14h 01mIberia
Deal found 6/4$399
Wed 10/22:44 pmONT - LHR
1 stop14h 01mIberia
Deal found 6/4$400
Wed 10/238:41 amONT - LHR
1 stop13h 44mIberia
Deal found 6/4$408
Wed 9/2512:49 amONT - LHR
2 stops27h 06mMultiple Airlines
Deal found 6/4$409
Mon 7/81:45 pmONT - LHR
2 stops14h 35mUnited Airlines
Deal found 6/4$414
Wed 7/105:10 amONT - LHR
1 stop20h 30mUnited Airlines
Deal found 6/4$418
Sat 7/271:45 pmONT - LHR
2 stops35h 55mUnited Airlines
Deal found 6/4$419

Find flights from Ontario to Heathrow within your budget

Customize your flight search to find flights from Ontario to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 5, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$544 - $641

Route

Depart

Return

Price

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 10/1

1 stop15h 50m

London Heathrow

Tue 10/15

2 stops22h 47m

$544

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 10/1

1 stop12h 57m

London Heathrow

Tue 10/8

2 stops18h 53m

$556

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 11/5

1 stop20h 00m

London Heathrow

Tue 11/26

1 stop13h 27m

$563

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 10/1

2 stops15h 28m

London Heathrow

Tue 10/15

2 stops16h 04m

$567

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 10/16

1 stop12h 10m

London Heathrow

Fri 10/25

1 stop13h 42m

$582

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 7/31

1 stop13h 12m

London Heathrow

Tue 8/27

1 stop14h 48m

$589

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 10/16

2 stops17h 15m

London Heathrow

Fri 10/25

2 stops21h 16m

$609

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Thu 11/7

2 stops16h 05m

London Heathrow

Tue 11/26

2 stops20h 16m

$617

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Mon 9/30

2 stops28h 10m

London Heathrow

Mon 10/7

2 stops28h 42m

$641

Flights are sorted by cheapest first

Deals found on 6/3

How far ahead should I book a flight from Ontario to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Heathrow. Price data was last updated on May 31, 2024.
The price you pay for your flight from Ontario to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 27 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Search Deals

What is the cheapest day to fly from Ontario to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Heathrow. Price data was last updated on June 2, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to London Heathrow Airport flight should consider departing on Thursday mornings when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
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Best time to book a flight from Ontario to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature and rainfall totals by month.

LON

Temperature

39.2 - 62.6 °F

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated June 5, 2024.
See what other customers who have flown with British Airways, KLM and American Airlines from Ontario to London have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
10,368 reviews

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Delta
8.0
Very good
10,368 reviews
Delta
8.0
Very good
10,368 reviews

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

KLM
7.9
Good
1,493 reviews
Delta
8.0
Very good
10,368 reviews

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

JetBlue
7.6
Good
4,316 reviews
Delta
8.0
Very good
10,368 reviews

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Virgin Atlantic
7.6
Good
718 reviews
Delta
8.0
Very good
10,368 reviews

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Avianca
7.5
Good
3,599 reviews
Delta
8.0
Very good
10,368 reviews

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Related info for your journey

Find useful and relevant information for your journey from Ontario to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to London Heathrow?

    If you book a flight to London Heathrow from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Ontario to London Heathrow per day from 6 different airlines.

  • Can I find flights from Ontario to London Heathrow Airport for under $600 on Cheapflights?

    Yes, there are multiple flights from Ontario to London Heathrow Airport for under $600. The cheapest flight booked recently is on British Airways for just $544, but on average you can expect to pay $576.

  • Are there last-minute flights available from Ontario to London Heathrow Airport for under $900?

    There are currently 20+ open flights from Ontario to London Heathrow Airport within the next 7 days for less than $900.

  • What are the cheapest airlines flying from Ontario to London Heathrow Airport round-trip?

    According to our current data, British Airways ($544), Delta ($556), and KLM ($563) offers the cheapest pricing from Ontario to London Heathrow Airport. British Airways is 24% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Ontario to London Heathrow Airport one-way?

    To fly one-way, consider booking your trip with Iberia, which is currently one of the cheapest options available, starting at $399. United Airlines flights start at $414 while deals on Air Canada start at $435 one-way.

  • What does ONT to LHR mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Ontario Airport to London Heathrow Airport flight would often be abbreviated as a ONT to LHR flight.

  • Can I find deals for flights from Ontario to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to Heathrow flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Heathrow flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Ontario to Heathrow that include hotel bookings?

    Yes. In addition to deals on Ontario to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Heathrow.

  • Can I find deals for business class flights from Ontario to Heathrow?

    Yes. Cheapflights offers flight deals from Ontario to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Ontario to Heathrow that allow pets onboard?

    Many airlines flying from Ontario to Heathrow offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to Heathrow?

    Yes, you can often find last-minute deals on Ontario to Heathrow flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to London Heathrow Airport flight deals updated?

    The Ontario to London Heathrow Airport flight deals you see on this page were last updated on 6/5.

  • What are the most popular airlines that fly from Ontario to London Heathrow Airport?

    When booking a flight from Ontario to London Heathrow Airport, you may want to consider flying on American Airlines, British Airways or Delta as they are the most popular for this route.

  • What is the cheapest month to book a flight from Ontario to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of $653). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of $1,102). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 6 airlines flying from Ontario to Heathrow

Discover the top 6 airlines that operate flights from Ontario to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 5, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$482Average$691FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$591Average$666FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$597Average$879FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$598Average$820FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$629Average$718FlexibilityNo cancel feeOn-time69%
IberiaCheapest$642Average$805FlexibilityNo cancel feeOn-time77%
Atlanta to Cancún flights
Phoenix to Houston flights
San Jose to Las Vegas flights
Portland to Denver flights
San Francisco to Puerto Vallarta flights
San Francisco to Amsterdam flights
Chicago to Guadalajara flights
Phoenix to Salt Lake City flights
Atlanta to Los Angeles flights
Chicago to Dubai flights
Pittsburgh to Chicago flights
Ontario to Lihue flights

Search flights from Ontario to Heathrow by cabin class

Find flights from Ontario to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Heathrow?

Cheapflights makes it easy to find Ontario to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Heathrow?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario to Heathrow for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Ontario to Heathrow with no change fees?

Certainly. Search results for flights to Heathrow from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Ontario to Heathrow become cheaper?

Yes! Start tracking prices for Ontario to Heathrow flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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