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Cheap flights from Seattle (SEA) to Porto (OPO) from $458

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 9/24. 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
May 27 — Jun 31
From?
To?
Mon 5/27
Mon 6/3
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Porto are usually found in February or November, booked 17 days in advance, depart on a Wednesday or Monday 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 May 22, 2024.

Popular in

June

Cheapest in

February

Average price

$1,338

Round-trip from

$523
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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Average for round-trip flights in May 2024
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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 Saturday. 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 $1,150 on average during February, but can be found for as low as $693.

When is the cheapest time to fly from Seattle to Porto (SEA - OPO)?

It’s optimal to fly from Seattle to Porto in the morning. By choosing this option you can save up to 12% on the cost of your flight, compared to a flight in the evening.

Cheap Air Canada flights from Seattle to Porto

Explore cheap flight options specifically provided by Air Canada for the route between Seattle and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,730,072 searches. Data last updated May 22, 2024.
Consider these cheap Air Canada flights we've found departing from Seattle to Porto. Be sure to come back soon if the deals available don't appeal to you at this time.
Sat 11/27:05 pmSEA - OPO
2 stops33h 30mAir Canada
Tue 11/126:00 amOPO - SEA
2 stops23h 08mAir Canada
Deal found 5/21$664
Wed 8/141:10 pmSEA - OPO
2 stops21h 20mAir Canada
Fri 8/306:15 amOPO - SEA
2 stops24h 05mAir Canada
Deal found 5/21$1,017
Tue 8/1311:10 pmSEA - OPO
2 stops35h 20mAir Canada
Fri 8/306:15 amOPO - SEA
2 stops35h 49mAir Canada
Deal found 5/21$1,023
Mon 8/1210:40 amSEA - OPO
2 stops16h 45mAir Canada
Wed 8/288:40 amOPO - SEA
2 stops17h 46mAir Canada
Deal found 5/21$1,052

Cheap Lufthansa flights from Seattle to Porto

Explore cheap flight options specifically provided by Lufthansa for the route between Seattle and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,730,072 searches. Data last updated May 22, 2024.
Some of the best deals we've found on Lufthansa flights traveling from Seattle to Porto. Ensure the flight price, dates, time, and airline match your criteria before you book.
Wed 10/302:50 pmSEA - OPO
1 stop17h 55mLufthansa
Wed 11/66:00 amOPO - SEA
2 stops22h 10mLufthansa
Deal found 5/22$679
Wed 10/302:50 pmSEA - OPO
1 stop17h 55mLufthansa
Wed 11/64:35 pmOPO - SEA
1 stop27h 25mLufthansa
Deal found 5/22$686
Sat 11/22:50 pmSEA - OPO
1 stop17h 55mLufthansa
Tue 11/124:35 pmOPO - SEA
1 stop27h 25mLufthansa
Deal found 5/21$910

Cheap Seattle to Porto flights in May & June 2024

Find cheap flight options from Seattle to Porto specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,730,072 searches. Prices were last updated on May 22, 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.
Tue 6/251:35 pmSEA - OPO
1 stop17h 55mDelta
Wed 7/104:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 5/22$1,038
Mon 6/246:20 pmSEA - OPO
1 stop30h 05mDelta
Wed 7/104:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 5/22$1,039
Tue 6/256:05 amSEA - OPO
2 stops25h 25mDelta
Wed 7/104:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 5/22$1,043
Sun 6/306:05 pmSEA - OPO
1 stop32h 35mDelta
Tue 7/169:15 amOPO - SEA
1 stop34h 05mDelta
Deal found 5/22$1,051
Mon 6/247:00 amSEA - OPO
3 stops40h 55mMultiple Airlines
Tue 7/21:30 pmOPO - SEA
3 stops31h 26mMultiple Airlines
Deal found 5/21$1,062
Mon 6/241:10 pmSEA - OPO
2 stops18h 30mMultiple Airlines
Thu 7/186:15 amOPO - SEA
2 stops23h 43mMultiple Airlines
Deal found 5/21$1,063
Sat 6/811:59 pmSEA - OPO
2 stops22h 56mUnited Airlines
Sat 6/229:15 amOPO - SEA
2 stops20h 56mUnited Airlines
Deal found 5/21$1,066
Sun 6/97:00 amSEA - OPO
3 stops30h 15mMultiple Airlines
Wed 6/266:45 amOPO - SEA
3 stops33h 47mMultiple Airlines
Deal found 5/22$1,075
Wed 6/266:20 pmSEA - OPO
1 stop30h 05mDelta
Wed 7/104:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 5/22$1,082

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 2,730,072 searches. Data last updated May 22, 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.
Sat 11/27:05 pmSEA - OPO
2 stops33h 30mAir Canada
Tue 11/126:00 amOPO - SEA
2 stops23h 08mAir Canada
Deal found 5/21$664
Wed 10/309:35 amSEA - OPO
2 stops26h 05mMultiple Airlines
Wed 11/66:00 amOPO - SEA
2 stops23h 08mMultiple Airlines
Deal found 5/22$667
Wed 10/302:50 pmSEA - OPO
1 stop17h 55mLufthansa
Wed 11/66:00 amOPO - SEA
2 stops22h 10mLufthansa
Deal found 5/22$679
Wed 10/302:50 pmSEA - OPO
1 stop17h 55mLufthansa
Wed 11/64:35 pmOPO - SEA
1 stop27h 25mLufthansa
Deal found 5/22$686
Sat 11/211:50 pmSEA - OPO
2 stops32h 55mUnited Airlines
Tue 11/1212:30 pmOPO - SEA
1 stop31h 30mUnited Airlines
Deal found 5/21$690
Sat 11/26:31 amSEA - OPO
3 stops50h 14mUnited Airlines
Tue 11/1212:30 pmOPO - SEA
2 stops19h 15mUnited Airlines
Deal found 5/21$696
Sat 11/910:51 pmSEA - OPO
2 stops32h 54mMultiple Airlines
Sat 11/161:45 pmOPO - SEA
1 stop35h 20mMultiple Airlines
Deal found 5/21$733
Sat 11/911:50 pmSEA - OPO
2 stops27h 45mUnited Airlines
Sat 11/1612:30 pmOPO - SEA
2 stops38h 29mUnited Airlines
Deal found 5/21$750
Wed 10/306:39 amSEA - OPO
3 stops50h 06mUnited Airlines
Wed 11/612:30 pmOPO - SEA
2 stops42h 40mUnited Airlines
Deal found 5/22$764

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 2,730,072 searches. Data last updated May 22, 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.
Tue 9/2411:35 amSEA - OPO
2 stops23h 05mMultiple Airlines
Deal found 5/22$458
Tue 9/249:38 amSEA - OPO
3 stops40h 22mMultiple Airlines
Deal found 5/22$475
Tue 9/249:29 pmSEA - OPO
1 stop17h 56mMultiple Airlines
Deal found 5/22$485
Sat 9/213:50 pmSEA - OPO
2 stops20h 40mMultiple Airlines
Deal found 5/21$519
Tue 8/273:50 pmSEA - OPO
2 stops19h 00mMultiple Airlines
Deal found 5/21$686
Tue 8/273:50 pmSEA - OPO
2 stops19h 00mMultiple Airlines
Deal found 5/22$687
Tue 8/276:40 pmSEA - OPO
1 stop37h 10mTurkish Airlines
Deal found 5/22$726
Tue 8/2712:15 pmSEA - OPO
1 stop19h 45mTurkish Airlines
Deal found 5/21$729
Sun 9/16:40 pmSEA - OPO
2 stops29h 20mMultiple Airlines
Deal found 5/21$755

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 2,730,072 searches. Data last updated May 22, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$664 - $1,026

Route

Depart

Return

Price

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 11/2

2 stops33h 30m

Porto

Tue 11/12

2 stops23h 08m

$664

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/30

2 stops26h 05m

Porto

Wed 11/6

2 stops23h 08m

$667

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/30

1 stop17h 55m

Porto

Wed 11/6

2 stops22h 10m

$679

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 11/2

2 stops32h 55m

Porto

Tue 11/12

1 stop31h 30m

$690

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 11/9

1 stop23h 45m

Porto

Sat 11/16

1 stop26h 05m

$778

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 10/31

2 stops17h 09m

Porto

Sun 11/3

2 stops20h 31m

$853

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/2

1 stop31h 05m

Porto

Wed 10/9

1 stop30h 20m

$919

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/18

2 stops21h 20m

Porto

Thu 9/26

2 stops17h 46m

$1,012

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/13

1 stop17h 55m

Porto

Mon 8/26

1 stop30h 50m

$1,026

Flights are sorted by cheapest first

Deals found on 5/21

When is the best time to 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 10, 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.
Search Deals

When is the cheapest time 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 May 19, 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. Thursday mornings 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

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 May 22, 2024.
To help decide which airline to fly from Seattle to Porto, see what other customers have to say about Air Canada, Lufthansa and United Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
10,585 reviews
Check prices

Food

7.4

Overall

8.0

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.0
Very good
10,585 reviews
Delta
8.0
Very good
10,585 reviews
Check prices

Food

7.4

Overall

8.0

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

KLM
7.9
Good
1,555 reviews
Delta
8.0
Very good
10,585 reviews
Check prices

Food

7.4

Overall

8.0

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

SWISS
7.8
Good
1,967 reviews
Delta
8.0
Very good
10,585 reviews
Check prices

Food

7.4

Overall

8.0

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Air France
7.6
Good
1,755 reviews
Delta
8.0
Very good
10,585 reviews
Check prices

Food

7.4

Overall

8.0

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Turkish Airlines
7.4
Good
3,712 reviews
Delta
8.0
Very good
10,585 reviews
Check prices

Food

7.4

Overall

8.0

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

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 $700 on Cheapflights?

    Yes, there are multiple flights from Seattle to Porto for under $700. The cheapest flight booked recently is on Air Canada for just $664, but on average you can expect to pay $788.

  • 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 $664 on this airline. Additional options worth looking into are Lufthansa and United Airlines, starting at $679 and $690 round-trip. Users have found that Air Canada is 42% cheaper than the other options available to this destination.

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

    $726 is the cheapest one-way deal found within the past few days, from Turkish Airlines. You may also be able to find cheap deals on United Airlines and TAP AIR PORTUGAL, with prices starting from $875 and $919, respectively.

  • 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 5/22.

  • 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.

  • When is the best time 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 $523). Flying from Seattle to Porto in June is currently the most expensive (average of $995). 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 Seattle to Porto
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Top 8 airlines flying from Seattle to Porto

Discover the top 8 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 2,730,072 searches. Data last updated May 22, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$544Average$725FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$696Average$1,081FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
KLMCheapest$759Average$1,099FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest$787Average$1,221FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest$880Average$1,162FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest$889Average$1,298FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Turkish AirlinesCheapest$914Average$976FlexibilityNo cancel feeOn-time77%
Search Turkish Airlines flights
Air FranceCheapest$1,116Average$1,562FlexibilityNo cancel feeOn-time77%
Search Air France flights
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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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Business Class
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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 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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