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$296+ Cheap flights from Seattle (SEA) to Porto (OPO)

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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OPO
nov. 26 — dic. 31
mar. 11/26
mar. 12/3
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Porto are usually found in January or February, booked 89 days in advance, depart on a Monday or Tuesday and return on a Monday

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 noviembre 21, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Popular in

June

Cheapest in

January

Round-trip from

$615
(Air Canada)

One-way from

$296
(Kiwi.com)
Provider with most accurate pricing for Seattle/Tacoma Intl-Porto flight deals.
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High demand for flights, 30% potential price rise
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Best time to find cheap flights, 30% 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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Find flight deals from Seattle to Porto

Cheapest flights from Seattle to Porto
Explore the most affordable flight options available from Seattle to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on noviembre 21, 2024.

This Mytrip deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/46:05 amSEA - OPO
2 stops33h 15mMultiple Airlines
mié. 12/116:05 amOPO - SEA
2 stops24h 05mMultiple Airlines
Deal found 11/20$755
This Gotogate deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/47:00 pmSEA - OPO
1 stop36h 25mTurkish Airlines
mié. 12/1111:00 amOPO - SEA
1 stop38h 05mTurkish Airlines
Deal found 11/19$800
This lol.travel deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/42:00 pmSEA - OPO
2 stops20h 40mSWISS
mié. 12/117:25 pmOPO - SEA
2 stops35h 21mSWISS
Deal found 11/20$850
This United Airlines deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/42:00 pmSEA - OPO
1 stop17h 15mUnited Airlines
mié. 12/116:00 amOPO - SEA
2 stops48h 10mUnited Airlines
Deal found 11/20$871
This KAYAK deal was found by Cheapflights users on 11/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/243:10 pmSEA - OPO
2 stops23h 15mLufthansa
mar. 1/71:45 pmOPO - SEA
2 stops54h 25mLufthansa
Deal found 11/21$1,480
This KLM deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/262:13 pmSEA - OPO
1 stop36h 17mKLM
lun. 12/306:20 amOPO - SEA
2 stops22h 26mKLM
Deal found 11/20$1,819
This Delta deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/262:13 pmSEA - OPO
1 stop17h 12mDelta
mié. 1/16:00 amOPO - SEA
2 stops22h 46mDelta
Deal found 11/20$2,049
This Air Canada deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/286:05 amSEA - OPO
2 stops21h 35mAir Canada
mié. 1/18:55 amOPO - SEA
2 stops20h 35mAir Canada
Deal found 11/20$2,374
This Aeromexico deal was found by Cheapflights users on 11/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Aeromexico is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/1512:34 pmSEA - OPO
1 stop14h 21mAir France
lun. 1/611:45 amOPO - SEA
1 stop31h 35mAir France
Deal found 11/21$2,431
This Iberia deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/241:35 pmSEA - OPO
2 stops22h 25mIberia
jue. 1/28:40 pmOPO - SEA
2 stops32h 38mIberia
Deal found 11/20$2,514

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 2,629,791 searches. Data last updated noviembre 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/18

10:35 am-3:15 pm

2 stops20h 40m

Porto

vie. 2/28

6:00 am-9:30 pm

2 stops23h 30m

$615

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

dom. 1/12

12:35 pm-10:55 am

1 stop14h 20m

Porto

lun. 1/27

11:15 am-11:50 am

1 stop32h 35m

$617

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/18

6:15 am-3:15 pm

3 stops25h 00m

Porto

jue. 2/27

6:00 am-9:30 pm

2 stops47h 30m

$619

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

dom. 1/12

3:25 pm-11:15 am

2 stops35h 50m

Porto

lun. 1/27

12:00 pm-9:20 pm

2 stops41h 20m

$630

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

vie. 1/24

1:45 pm-4:00 pm

2 stops18h 15m

Porto

vie. 1/31

8:20 am-11:11 pm

2 stops22h 51m

$670

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/18

10:24 am-8:00 pm

2 stops25h 36m

Porto

jue. 2/27

8:20 am-8:35 pm

2 stops20h 15m

$723

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

sáb. 3/1

2:00 pm-10:25 pm

1 stop24h 25m

Porto

sáb. 3/15

6:00 am-6:45 pm

2 stops19h 45m

$732

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

jue. 2/27

7:00 pm-9:40 am

1 stop30h 40m

Porto

jue. 3/20

11:00 am-6:05 pm

1 stop38h 05m

$772

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

jue. 1/30

3:15 pm-7:25 pm

2 stops20h 10m

$296

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

jue. 1/30

1:35 pm-10:50 am

1 stop13h 15m

$514

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Showing 1-10 of 15 results
1
2

Compare providers for flights from Seattle to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Porto in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Porto flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Travel insights for flights from Seattle to Porto

Get recent, data-driven insights about flights from Seattle to Porto including ideal travel times, pricing trends, and more.

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 November 15, 2024.

Booking 89 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.

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 $517). Flying from Seattle to Porto in June is currently the most expensive (average of $993). 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.

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

Find hourly flight availability from Seattle to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated noviembre 21, 2024.

It’s optimal to fly from Seattle to Porto in the evening. By choosing this option you can save up to 23% on the cost of your flight, compared to a flight in the morning.

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 November 18, 2024.

Travelers seeking maximum savings on their Seattle to Porto flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Porto by month

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

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

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

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 noviembre 21, 2024.
KLM
7.8
Good
1,350 reviews

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Boarding

7.9

Crew

8.4

Reviews

1 / 10

Flight performed by El Al. The aircraft was dirty. Gum in front pcket. Poorly maintained.

KLM
7.8
Good
1,350 reviews
KLM
7.8
Good
1,350 reviews

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Boarding

7.9

Crew

8.4

Reviews

1 / 10

Flight performed by El Al. The aircraft was dirty. Gum in front pcket. Poorly maintained.

SWISS
7.6
Good
1,637 reviews
KLM
7.8
Good
1,350 reviews

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Boarding

7.9

Crew

8.4

Reviews

1 / 10

Flight performed by El Al. The aircraft was dirty. Gum in front pcket. Poorly maintained.

Air France
7.4
Good
1,525 reviews
KLM
7.8
Good
1,350 reviews

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Boarding

7.9

Crew

8.4

Reviews

1 / 10

Flight performed by El Al. The aircraft was dirty. Gum in front pcket. Poorly maintained.

Turkish Airlines
7.4
Good
3,914 reviews
KLM
7.8
Good
1,350 reviews

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Boarding

7.9

Crew

8.4

Reviews

1 / 10

Flight performed by El Al. The aircraft was dirty. Gum in front pcket. Poorly maintained.

United Airlines
7.4
Good
9,172 reviews
KLM
7.8
Good
1,350 reviews

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Boarding

7.9

Crew

8.4

Reviews

1 / 10

Flight performed by El Al. The aircraft was dirty. Gum in front pcket. Poorly maintained.

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.

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

    Our cheapest airline available from Seattle to Porto is Air Canada. Our recent data shows that you can find tickets from as low as $615 on this airline. Additional options worth looking into are KLM and United Airlines, starting at $618 and $619 round-trip. Users have found that Air Canada is 44% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Porto one-way?

    $514 is the cheapest one-way deal found within the past few days, from KLM. You may also be able to find cheap deals on Turkish Airlines and Air France, with prices starting from $1,265 and $1,854, respectively.

  • 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.

  • 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 $517). Flying from Seattle to Porto in June is currently the most expensive (average of $993). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Seattle to Porto

Discover the top 6 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 2,629,791 searches. Data last updated noviembre 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$544Average$771FlexibilityNo cancel feeOn-time71%
DeltaCheapest$635Average$1,133FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$753Average$1,133FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$759Average$967FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$769Average$1,209FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$851Average$1,326FlexibilityNo cancel feeOn-time69%
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