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Cheap flights from Seattle (SEA) to Porto (OPO) from $271

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 10/11. 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.
SEA — OPO
Jun 10 — Jun 171
From?
To?
Mon 6/10
Mon 6/17
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Porto are usually found in February or November, booked 16 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap flight deals from Seattle to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Porto (OPO). 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

June

Cheapest in

February

Round-trip from

$524

One-way from

$271
High demand for flights, 32% potential price rise
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Best time to find cheap flights, 34% potential price drop
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From Seattle/Tacoma Intl to Porto
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One-way flight from Seattle/Tacoma Intl to Porto
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What is the cheapest day to fly round-trip from Seattle to Porto?

Flights from Seattle to Porto are found to be more expensive on Wednesday. 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 Porto.

How far in advance should I book a flight from Seattle to Porto?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 17 days in advance, which can save you up to 52% on flights from Seattle to Porto compared to booking the week you need them. Waiting 17 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $984. For sooner than that we have options available in the next 3 days from $2,570.

What is the cheapest month to fly from Seattle to Porto?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, February can be a great choice for travel to Porto. Flights to Porto from Seattle in February are about $1,145 on average during February, but can be found for as low as $693.

What is the cheapest time of day to fly from SEA to OPO?

It’s optimal to fly from Seattle to Porto in the morning. By choosing this option you can save up to 4% on the cost of your flight, compared to a flight in the evening.

Cheap Seattle to Porto flights in June & July 2024

Find cheap flight options from Seattle to Porto 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 Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.
Mon 7/151:35 pmSEA - OPO
1 stop17h 55mDelta
Tue 8/64:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 6/4$918
Sun 7/146:15 pmSEA - OPO
1 stop30h 10mDelta
Tue 8/64:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 6/4$919
Sun 7/219:45 amSEA - OPO
2 stops21h 45mDelta
Tue 8/64:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 6/5$920
Sun 7/149:45 amSEA - OPO
2 stops21h 45mDelta
Tue 8/64:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 6/4$922
Wed 7/35:10 amSEA - OPO
2 stops22h 30mAmerican Airlines
Wed 7/108:15 amOPO - SEA
2 stops19h 33mAmerican Airlines
Deal found 6/4$923
Tue 7/21:35 pmSEA - OPO
1 stop17h 55mDelta
Tue 7/239:15 amOPO - SEA
2 stops21h 10mDelta
Deal found 6/4$943
Tue 7/21:35 pmSEA - OPO
1 stop17h 55mDelta
Tue 7/234:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 6/4$945
Mon 7/111:02 pmSEA - OPO
2 stops25h 23mDelta
Tue 7/239:15 amOPO - SEA
2 stops21h 10mDelta
Deal found 6/4$948
Mon 7/111:02 pmSEA - OPO
2 stops25h 23mDelta
Tue 7/234:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 6/4$949

Seattle to Porto 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Porto 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 Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.
Mon 11/46:45 pmSEA - OPO
2 stops28h 55mIberia
Wed 11/138:40 pmOPO - SEA
2 stops34h 19mIberia
Deal found 6/4$617
Wed 10/303:35 pmSEA - OPO
1 stop20h 55mKLM
Fri 11/811:15 amOPO - SEA
2 stops20h 16mKLM
Deal found 6/4$639
Mon 11/412:40 pmSEA - OPO
1 stop14h 10mDelta
Wed 11/1311:15 amOPO - SEA
2 stops20h 16mDelta
Deal found 6/4$656
Wed 10/303:00 pmSEA - OPO
1 stop17h 25mMultiple Airlines
Fri 11/86:05 amOPO - SEA
1 stop15h 15mMultiple Airlines
Deal found 6/4$669
Wed 10/307:20 amSEA - OPO
2 stops20h 10mDelta
Fri 11/85:00 amOPO - SEA
2 stops25h 20mDelta
Deal found 6/4$673
Mon 11/41:50 pmSEA - OPO
1 stop24h 35mLufthansa
Wed 11/134:35 pmOPO - SEA
1 stop27h 25mLufthansa
Deal found 6/4$685
Sat 11/211:50 pmSEA - OPO
2 stops32h 35mUnited Airlines
Tue 11/1212:30 pmOPO - SEA
1 stop31h 40mUnited Airlines
Deal found 6/4$690
Sat 11/26:39 amSEA - OPO
3 stops46h 01mUnited Airlines
Tue 11/1212:30 pmOPO - SEA
1 stop31h 40mUnited Airlines
Deal found 6/4$708
Sat 11/23:00 pmSEA - OPO
1 stop24h 25mLufthansa
Tue 11/124:30 pmOPO - SEA
1 stop27h 40mLufthansa
Deal found 6/4$789

One-way flights to Porto from Seattle

Search for one-way flight options from Seattle to Porto. 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 Seattle to Porto can choose from these deals. Those needing a return flight from Seattle to Porto can use the search form above.
Fri 10/111:50 pmSEA - OPO
2 stops18h 40mMultiple Airlines
Deal found 6/4$271
Mon 10/73:50 pmSEA - OPO
2 stops18h 50mMultiple Airlines
Deal found 6/4$309
Tue 8/271:50 pmSEA - OPO
2 stops24h 35mMultiple Airlines
Deal found 6/4$356
Wed 9/183:50 pmSEA - OPO
2 stops18h 40mMultiple Airlines
Deal found 6/5$369
Tue 7/237:00 amSEA - OPO
2 stops42h 15mMultiple Airlines
Deal found 6/4$375
Sun 9/153:50 pmSEA - OPO
2 stops21h 30mMultiple Airlines
Deal found 6/5$377
Tue 10/83:50 pmSEA - OPO
2 stops19h 00mMultiple Airlines
Deal found 6/4$379
Tue 8/271:50 pmSEA - OPO
3 stops24h 00mMultiple Airlines
Deal found 6/4$403
Tue 7/235:50 amSEA - OPO
3 stops31h 25mMultiple Airlines
Deal found 6/4$416

Find flights from Seattle to Porto within your budget

Customize your flight search to find flights from Seattle to Porto 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

$896 - $1,343

Route

Depart

Return

Price

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/14

2 stops20h 15m

Porto

Wed 8/28

2 stops23h 53m

$896

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 7/3

2 stops22h 30m

Porto

Wed 7/10

2 stops19h 33m

$923

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 7/17

1 stop17h 55m

Porto

Thu 8/8

1 stop16h 25m

$951

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/13

2 stops25h 15m

Porto

Wed 8/28

2 stops22h 14m

$1,053

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/31

1 stop16h 05m

Porto

Sat 9/14

1 stop32h 55m

$1,099

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 7/3

1 stop20h 05m

Porto

Wed 7/10

1 stop25h 55m

$1,103

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 8/2

2 stops21h 55m

Porto

Sat 8/17

2 stops32h 41m

$1,127

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 8/9

1 stop20h 30m

Porto

Mon 8/19

2 stops32h 24m

$1,299

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 7/10

2 stops21h 20m

Porto

Wed 7/31

2 stops38h 01m

$1,343

Flights are sorted by cheapest first

Deals found on 6/4

How far ahead should I book a flight from Seattle to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Porto. Price data was last updated on May 31, 2024.
Booking 16 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Porto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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What is the cheapest day to fly from Seattle to Porto?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Porto. Price data was last updated on June 2, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to Porto flight should consider departing on Saturday mornings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from Seattle to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Seattle 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 Porto by month

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

OPO

Temperature

48.2 - 68 °F

If weather is an important factor for your trip to Porto, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated June 5, 2024.
To help decide which airline to fly from Seattle to Porto, see what other customers have to say about Air France, Delta and American Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.2
Very good
1,418 reviews

Boarding

8.4

Comfort

8.1

Overall

8.2

Entertainment

8.1

Crew

8.7

Food

7.8

Reviews

1 / 10

They changed my flight but didn't notify the other carrier. I can't do online check-in and had to wait 30 min to get it all sort out at the counter.

Singapore Airlines
8.2
Very good
1,418 reviews
Singapore Airlines
8.2
Very good
1,418 reviews

Boarding

8.4

Comfort

8.1

Overall

8.2

Entertainment

8.1

Crew

8.7

Food

7.8

Reviews

1 / 10

They changed my flight but didn't notify the other carrier. I can't do online check-in and had to wait 30 min to get it all sort out at the counter.

Delta
8.0
Very good
10,368 reviews
Singapore Airlines
8.2
Very good
1,418 reviews

Boarding

8.4

Comfort

8.1

Overall

8.2

Entertainment

8.1

Crew

8.7

Food

7.8

Reviews

1 / 10

They changed my flight but didn't notify the other carrier. I can't do online check-in and had to wait 30 min to get it all sort out at the counter.

KLM
7.9
Good
1,493 reviews
Singapore Airlines
8.2
Very good
1,418 reviews

Boarding

8.4

Comfort

8.1

Overall

8.2

Entertainment

8.1

Crew

8.7

Food

7.8

Reviews

1 / 10

They changed my flight but didn't notify the other carrier. I can't do online check-in and had to wait 30 min to get it all sort out at the counter.

SWISS
7.8
Good
1,934 reviews
Singapore Airlines
8.2
Very good
1,418 reviews

Boarding

8.4

Comfort

8.1

Overall

8.2

Entertainment

8.1

Crew

8.7

Food

7.8

Reviews

1 / 10

They changed my flight but didn't notify the other carrier. I can't do online check-in and had to wait 30 min to get it all sort out at the counter.

Air France
7.5
Good
1,720 reviews
Singapore Airlines
8.2
Very good
1,418 reviews

Boarding

8.4

Comfort

8.1

Overall

8.2

Entertainment

8.1

Crew

8.7

Food

7.8

Reviews

1 / 10

They changed my flight but didn't notify the other carrier. I can't do online check-in and had to wait 30 min to get it all sort out at the counter.

Related info for your journey

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

  • Can I find flights from Seattle to Porto for under $900 on Cheapflights?

    Yes, there are multiple flights from Seattle to Porto for under $900. The cheapest flight booked recently is on Delta for just $896, but on average you can expect to pay $945.

  • What are the cheapest airlines flying from Seattle to Porto round-trip?

    Our cheapest airline available from Seattle to Porto is Delta. Our recent data shows that you can find tickets from as low as $896 on this airline. Additional options worth looking into are American Airlines and Air France, starting at $923 and $951 round-trip. Users have found that Delta is 21% cheaper than the other options available to this destination.

  • What does SEA to OPO mean?

    This is defined as Seattle/Tacoma Intl Airport (SEA) and Porto Airport (OPO). Codes like Porto Airport are often used to just call airports uniquely.

  • Can I find deals for flights from Seattle to Porto that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Porto 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 Seattle to Porto with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Porto 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 Seattle to Porto that include hotel bookings?

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

  • How can I find direct flights from Seattle to Porto?

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

  • Can I find deals for business class flights from Seattle to Porto?

    Yes. Cheapflights offers flight deals from Seattle to Porto 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 Seattle to Porto that allow pets onboard?

    Many airlines flying from Seattle to Porto 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 Seattle to Porto?

    Yes, you can often find last-minute deals on Seattle to Porto 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 Seattle to Porto flight deals updated?

    The Seattle to Porto flight deals you see on this page were last updated on 6/5.

  • What are the most popular airlines that fly from Seattle to Porto?

    When booking a flight from Seattle to Porto, you may want to consider flying on American Airlines, Air France or British Airways as they are the most popular for this route.

  • What is the cheapest month to book a flight from Seattle to Porto?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Porto (average of $524). Flying from Seattle to Porto in June is currently the most expensive (average of $986). 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 9 airlines flying from Seattle to Porto

Discover the top 9 airlines that operate flights from Seattle to Porto. 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
American AirlinesCheapest$544Average$725FlexibilityNo cancel feeOn-time71%
IberiaCheapest$651Average$1,130FlexibilityNo cancel feeOn-time77%
DeltaCheapest$725Average$1,081FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$761Average$1,138FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$846Average$1,175FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$857Average$1,147FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$911Average$1,358FlexibilityNo cancel feeOn-time69%
Turkish AirlinesCheapest$914Average$976FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$1,116Average$1,562FlexibilityNo cancel feeOn-time77%
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Search flights from Seattle to Porto by cabin class

Find flights from Seattle to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first 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 Seattle to Porto?

Deals for Seattle to Porto flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Porto?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Porto from Seattle.

Can Cheapflights find flights from Seattle to Porto with no change fees?

Yes, we can. To see specific flights from Seattle to Porto with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Porto become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Porto from Seattle today and book when prices fit your budget.

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