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Cheap flights from Seattle to Porto from $299

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Porto departing on 9/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Porto

Cheap round-trip flights

 Logo
10:05 am - 11:40 amSEA-OPO
17h 35m2 stops
 Logo
4:15 pm - 12:10 pmOPO-SEA
27h 55m1 stop
Mon, Nov 17 - Mon, Dec 1
United Airlines Logo
11:40 pm - 9:45 amSEA-OPO
26h 05m2 stops
United Airlines Logo
12:30 pm - 12:10 pmOPO-SEA
31h 40m1 stop
$610United Airlines
Find Deal
Tue, Oct 14 - Wed, Nov 5
United Airlines Logo
8:00 am - 9:30 amSEA-OPO
17h 30m2 stops
United Airlines Logo
12:30 pm - 9:56 pmOPO-SEA
41h 26m2 stops
$611United Airlines
Find Deal
Mon, Nov 17 - Mon, Dec 1
Lufthansa Logo
2:00 pm - 2:55 pmSEA-OPO
16h 55m1 stop
Lufthansa Logo
12:30 pm - 12:10 pmOPO-SEA
31h 40m1 stop
$617Lufthansa
Find Deal
Mon, Nov 17 - Mon, Dec 1
Lufthansa Logo
2:20 pm - 3:45 pmSEA-OPO
17h 25m1 stop
Lufthansa Logo
12:30 pm - 12:10 pmOPO-SEA
31h 40m1 stop
$621Lufthansa
Find Deal
Tue, Oct 14 - Wed, Nov 5
Turkish Airlines Logo
7:10 pm - 3:50 pmSEA-OPO
36h 40m1 stop
Turkish Airlines Logo
4:50 pm - 10:35 amOPO-SEA
25h 45m1 stop
$647Turkish Airlines
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Wed, Oct 1 - Wed, Oct 8
Turkish Airlines Logo
7:10 pm - 10:05 amSEA-OPO
30h 55m1 stop
Turkish Airlines Logo
4:50 pm - 5:15 pmOPO-SEA
32h 25m1 stop
$673Turkish Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 21
Air Canada Logo
8:15 am - 12:50 pmSEA-OPO
21h 35m2 stops
Air Canada Logo
6:15 am - 7:16 pmOPO-SEA
21h 01m2 stops
$715Air Canada
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Sat, Nov 1 - Sun, Nov 9
Air Canada Logo
7:20 am - 9:35 amSEA-OPO
18h 15m1 stop
Air Canada Logo
12:50 pm - 6:36 pmOPO-SEA
37h 46m2 stops
$738Air Canada
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Mon, Aug 18 - Tue, Aug 26
British Airways Logo
2:35 pm - 7:15 pmSEA-OPO
21h 40m1 stop
British Airways Logo
8:05 pm - 4:55 pmOPO-SEA
28h 50m1 stop
$741British Airways
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Sat, Nov 1 - Sun, Nov 9

Turkish Airlines flights from Seattle to Porto

Our best Turkish Airlines deals on Seattle to Porto flight tickets
Turkish Airlines
Oct 1
SEA7:10 pmSeattle/Tacoma Intl
36h 40m
1 stop
OPO3:50 pmPorto
Oct 8
OPO4:50 pmPorto
25h 45m
1 stop
SEA10:35 amSeattle/Tacoma Intl
Turkish Airlines
Oct 14
SEA7:10 pmSeattle/Tacoma Intl
30h 55m
1 stop
OPO10:05 amPorto
Oct 21
OPO4:50 pmPorto
32h 25m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
Turkish Airlines
Oct 5
SEA7:10 pmSeattle/Tacoma Intl
30h 40m
1 stop
OPO9:50 amPorto
Oct 20
OPO4:50 pmPorto
25h 45m
1 stop
SEA10:35 amSeattle/Tacoma Intl

Air Canada flights from Seattle to Porto

Our best Air Canada deals on Seattle to Porto flight tickets
Air Canada
Nov 1
SEA8:15 amSeattle/Tacoma Intl
21h 35m
2 stops
OPO12:50 pmPorto
Nov 9
OPO6:15 amPorto
21h 01m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
Air Canada
Aug 18
SEA7:20 amSeattle/Tacoma Intl
18h 15m
1 stop
OPO9:35 amPorto
Aug 26
OPO12:50 pmPorto
37h 46m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
Air Canada
Aug 12
SEA7:15 pmSeattle/Tacoma Intl
30h 05m
2 stops
OPO9:20 amPorto
Aug 21
OPO12:10 pmPorto
34h 06m
2 stops
SEA2:16 pmSeattle/Tacoma Intl

See travel insights to Porto from

How to get the cheapest flight ticket from Seattle to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Porto?

The month of January is, on average, the cheapest month to fly to Porto from Seattle, with most prices found around $769. If you aren’t able to travel during the month of January, then book flights to Porto from Seattle during March instead. Flights to Porto in March, while not as cheap as those in January, still average around $790.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Tuesday when prices can be found for as low as $1,008. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $1,286. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the evening is the cheapest time of day to fly from Seattle to Porto when you can find flight prices for as low as $837. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,130 on average. Flights to Porto from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to Porto from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $1,032 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Seattle for as low as $804 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 17% on your flight if you consider stops on a Seattle to Porto flight.

How have Seattle to Porto flight prices changed over time?

As of July 2025, prices for Seattle to Porto flights are approximately 43% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Porto (SEA to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Porto

Best Price Found

$299

Fastest flight time

13h 30m

Direct flights

None

Airports in Porto

1 airport
The best one-way flight to Porto from Seattle in the past 72 hours is $299. The best round-trip flight deal from Seattle to Porto found on momondo in the last 72 hours is $594.
The fastest flight from Seattle to Porto takes 13h 30m
There are no direct flights from Seattle to Porto. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Porto Airport.
There is 1 airport near Porto: Porto (OPO)

  • How far is Seattle/Tacoma Intl to Porto by plane?

    Seattle/Tacoma Intl and Porto are 5083.1 mi apart from one another. Typically, this will take 13h 45m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Porto Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Porto Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Porto Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Porto Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The travel and health documents you'll need for your trip to Porto Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Seattle to Porto?


Best airlines flying from Seattle to Porto

Compare and see reviews for airlines that fly from Seattle to Porto with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $636Free CancellationRating
8.0
7,958 reviews
Search Delta flights
LufthansaPriceFrom $642Free CancellationRating
6.8
7,193 reviews
Search Lufthansa flights
KLMPriceFrom $648Free CancellationRating
7.8
1,370 reviews
Search KLM flights
British AirwaysPriceFrom $673Free CancellationRating
6.6
7,103 reviews
Search British Airways flights
United AirlinesPriceFrom $707Free CancellationRating
7.4
8,843 reviews
Search United Airlines flights
Turkish AirlinesPriceFrom $759Free CancellationRating
7.3
3,896 reviews
Search Turkish Airlines flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Aveiro
Matosinhos
Caminha
Braga
Guimarães
Chaves
Esposende
Arcos de Valdevez
Lamego
Espinho
Viseu
Ponte de Lima
Santa Maria da Feira
Curia
Mesao Frio
Pinhao
Penafiel
Baiao

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Porto?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Porto from Seattle.

Can I find flights from Seattle to Porto with flexible booking policies on momondo?

Yes. All flights to Porto from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to Porto?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Porto.

I’m not ready to book a flight from Seattle to Porto right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Porto, momondo offers a useful price alert feature which will track prices for flights to Porto from Seattle and alert you when they change.


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1 adult
Mon 7/14
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