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$796+ Cheap flights from Porto (OPO) to Seattle (SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/17. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Dec 27 — Jan 31
Fri 12/27
Fri 1/3
1 adult, Economy
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Cheap flight deals from Porto to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) to Seattle (SEA). 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 December 22, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$796
(KLM)

Popular in

June

Cheapest in

October

Average price

$870
Provider with most accurate pricing for Porto-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Porto-Seattle/Tacoma Intl flights.
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From Porto to Seattle/Tacoma Intl
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High demand for flights, 18% potential price rise
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Best time to find cheap flights, 5% potential price drop
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Average for round-trip flights in December 2024
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Find flight deals from Porto to Seattle

Best flights from Porto to Seattle
Discover carefully curated flight deals from Porto to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 22, 2024.

This KLM deal was found by Cheapflights users on 12/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/176:30 amOPO - SEA
1 stop17h 30mKLM
Mon 7/71:35 pmSEA - OPO
1 stop17h 55mKLM
Deal found 12/21$796
This Air France deal was found by Cheapflights users on 12/21. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1711:25 amOPO - SEA
2 stops20h 33mMultiple Airlines
Mon 7/71:30 pmSEA - OPO
1 stop18h 00mMultiple Airlines
Deal found 12/21$802
This United Airlines deal was found by Cheapflights users on 12/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/46:00 amOPO - SEA
2 stops39h 20mUnited Airlines
Tue 1/77:00 amSEA - OPO
3 stops24h 15mUnited Airlines
Deal found 12/21$2,012
This Flightnetwork deal was found by Cheapflights users on 12/21. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/410:40 amOPO - SEA
1 stop38h 25mTurkish Airlines
Tue 1/77:00 pmSEA - OPO
1 stop31h 00mTurkish Airlines
Deal found 12/21$2,175
This business-class.com deal was found by Cheapflights users on 12/21. 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 business-class.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/194:30 pmOPO - SEA
1 stop27h 40mLufthansa
Sun 3/210:35 amSEA - OPO
2 stops17h 00mLufthansa
Deal found 12/21$3,453
This Justfly.com deal was found by Cheapflights users on 12/21. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/196:30 pmOPO - SEA
1 stop30h 25mBritish Airways
Sun 3/26:50 pmSEA - OPO
1 stop31h 05mBritish Airways
Deal found 12/21$3,593

Find flights from Porto to Seattle within your budget

Customize your flight search to find flights from Porto to Seattle 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 2,558,603 searches. Data last updated December 22, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 6/17

6:30 am-4:00 pm

1 stop17h 30m

Seattle/Tacoma Intl

Mon 7/7

1:35 pm-3:30 pm

1 stop17h 55m

$796

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 6/17

11:25 am-11:58 pm

2 stops20h 33m

Seattle/Tacoma Intl

Mon 7/7

1:30 pm-3:30 pm

1 stop18h 00m

$802

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/4

6:00 am-1:20 pm

2 stops39h 20m

Seattle/Tacoma Intl

Tue 1/7

7:00 am-3:15 pm

3 stops24h 15m

$2,012

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/4

10:40 am-5:05 pm

1 stop38h 25m

Seattle/Tacoma Intl

Tue 1/7

7:00 pm-10:00 am

1 stop31h 00m

$2,175

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 2/19

4:30 pm-12:10 pm

1 stop27h 40m

Seattle/Tacoma Intl

Sun 3/2

10:35 am-11:35 am

2 stops17h 00m

$3,453

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 2/19

6:30 pm-4:55 pm

1 stop30h 25m

Seattle/Tacoma Intl

Sun 3/2

6:50 pm-9:55 am

1 stop31h 05m

$3,593

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/4

10:40 am-5:05 pm

1 stop38h 25m

$2,049

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/4

6:00 am-1:24 pm

2 stops39h 24m

$2,254

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/4

11:00 am-10:00 pm

3 stops43h 00m

$2,326

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

  • Most accurate provider: When it comes to deals on Porto-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Porto-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Porto-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Porto-Seattle 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 Porto-Seattle 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 Porto to Seattle

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

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

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

Currently, January is the cheapest month in which you can book a flight from Porto to Seattle (average of $238). Flying from Porto to Seattle in July is currently the most expensive (average of $411). 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.

Rainfall in Seattle by month

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

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

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

If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated December 22, 2024.
KLM
7.8
Good
1,342 reviews

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.9

Comfort

7.7

Entertainment

7.2

Reviews

1 / 10

Flight was late do to issues with loading stuff. One of the two bathrooms in business class was not working. WiFi did not work 80% of the time. My bag came out last even though it had a priority tag

KLM
7.8
Good
1,342 reviews
KLM
7.8
Good
1,342 reviews

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.9

Comfort

7.7

Entertainment

7.2

Reviews

1 / 10

Flight was late do to issues with loading stuff. One of the two bathrooms in business class was not working. WiFi did not work 80% of the time. My bag came out last even though it had a priority tag

United Airlines
7.4
Good
9,035 reviews
KLM
7.8
Good
1,342 reviews

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.9

Comfort

7.7

Entertainment

7.2

Reviews

1 / 10

Flight was late do to issues with loading stuff. One of the two bathrooms in business class was not working. WiFi did not work 80% of the time. My bag came out last even though it had a priority tag

Turkish Airlines
7.3
Good
3,900 reviews
KLM
7.8
Good
1,342 reviews

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.9

Comfort

7.7

Entertainment

7.2

Reviews

1 / 10

Flight was late do to issues with loading stuff. One of the two bathrooms in business class was not working. WiFi did not work 80% of the time. My bag came out last even though it had a priority tag

Lufthansa
6.8
Okay
7,080 reviews
KLM
7.8
Good
1,342 reviews

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.9

Comfort

7.7

Entertainment

7.2

Reviews

1 / 10

Flight was late do to issues with loading stuff. One of the two bathrooms in business class was not working. WiFi did not work 80% of the time. My bag came out last even though it had a priority tag

British Airways
6.6
Okay
6,815 reviews
KLM
7.8
Good
1,342 reviews

Crew

8.4

Overall

7.8

Food

7.3

Boarding

7.9

Comfort

7.7

Entertainment

7.2

Reviews

1 / 10

Flight was late do to issues with loading stuff. One of the two bathrooms in business class was not working. WiFi did not work 80% of the time. My bag came out last even though it had a priority tag

Related info for your journey

Find useful and relevant information for your journey from Porto to Seattle. 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 Porto to Seattle round-trip?

    Currently priced at $796, KLM will fly you from Porto to Seattle and back. In addition to KLM, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Turkish Airlines - these airlines can fly you to your destination from $2,012 and $2,175, respectively. Users have found that KLM is 15% cheaper than the other options available to this destination.

  • Can I find deals for flights from Porto to Seattle that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Porto to Seattle 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 Porto to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Porto to Seattle (average of $238). Flying from Porto to Seattle in July is currently the most expensive (average of $411). 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

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Alternative routes for Porto to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Lisbon to Seattle flights
Lisbon to Portland flights

Top airline flying from Porto to Seattle

Discover the top airline that operate flights from Porto to Seattle. 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 2,558,603 searches. Data last updated December 22, 2024.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$756Average$870FlexibilityNo cancel feeOn-time75%
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