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Cheap flights from Seattle to Porto from $389

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 3/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Seattle to Porto

Cheap round-trip flights

These are some of the best round-trip flight deals from Seattle to Porto that have been recently found on momondo from popular airlines, departing in the coming months.
12:35 pm - 10:50 amSEA-OPO
14h 15m1 stop
12:15 pm - 12:40 pmOPO-SEA
31h 25m1 stop
$593KLM
Find Deal
Mon, Mar 3 - Mon, Mar 10
9:20 am - 10:50 amSEA-OPO
17h 30m2 stops
4:10 pm - 12:40 pmOPO-SEA
27h 30m1 stop
Mon, Mar 3 - Mon, Mar 10
12:35 pm - 10:55 amSEA-OPO
14h 20m1 stop
11:45 am - 6:58 pmOPO-SEA
38h 13m2 stops
$654Delta
Find Deal
Sun, Mar 2 - Mon, Mar 17
6:15 am - 10:55 amSEA-OPO
20h 40m2 stops
6:20 am - 9:31 pmOPO-SEA
22h 11m2 stops
$703Delta
Find Deal
Sun, Mar 2 - Mon, Mar 17
3:00 pm - 10:25 pmSEA-OPO
24h 25m1 stop
1:45 pm - 2:20 pmOPO-SEA
31h 35m1 stop
$778Lufthansa
Find Deal
Mon, Mar 10 - Mon, Mar 17
3:00 pm - 3:25 pmSEA-OPO
17h 25m1 stop
1:45 pm - 2:20 pmOPO-SEA
31h 35m1 stop
$779Lufthansa
Find Deal
Mon, Mar 10 - Mon, Mar 17
5:40 pm - 11:40 amSEA-OPO
35h 00m3 stops
12:25 pm - 9:30 pmOPO-SEA
40h 05m2 stops
$809United Airlines
Find Deal
Mon, Mar 10 - Mon, Mar 17
7:00 pm - 9:50 amSEA-OPO
30h 50m1 stop
4:10 pm - 6:05 pmOPO-SEA
32h 55m1 stop
$819Turkish Airlines
Find Deal
Mon, Mar 3 - Mon, Mar 10
7:00 pm - 9:50 amSEA-OPO
30h 50m1 stop
4:10 pm - 6:59 pmOPO-SEA
57h 49m2 stops
$835Turkish Airlines
Find Deal
Mon, Mar 3 - Mon, Mar 10
6:05 am - 11:40 amSEA-OPO
22h 35m2 stops
6:00 am - 9:15 pmOPO-SEA
22h 15m2 stops
$860United Airlines
Find Deal
Fri, Mar 21 - Fri, Mar 28

KLM flights from Seattle to Porto

Our best KLM deals on Seattle to Porto flight tickets
KLM
Mar 3
SEA12:35 pmSeattle/Tacoma Intl
14h 15m
1 stop
OPO10:50 amPorto
Mar 10
OPO12:15 pmPorto
31h 25m
1 stop
SEA12:40 pmSeattle/Tacoma Intl
KLM
Mar 2
SEA12:35 pmSeattle/Tacoma Intl
14h 20m
1 stop
OPO10:55 amPorto
Mar 17
OPO4:10 pmPorto
27h 30m
1 stop
SEA12:40 pmSeattle/Tacoma Intl
KLM
Mar 3
SEA12:35 pmSeattle/Tacoma Intl
14h 15m
1 stop
OPO10:50 amPorto
Mar 10
OPO11:15 amPorto
32h 25m
1 stop
SEA12:40 pmSeattle/Tacoma Intl

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Mar 2
SEA12:35 pmSeattle/Tacoma Intl
14h 20m
1 stop
OPO10:55 amPorto
Mar 17
OPO11:45 amPorto
38h 13m
2 stops
SEA6:58 pmSeattle/Tacoma Intl
Delta
Mar 2
SEA6:15 amSeattle/Tacoma Intl
20h 40m
2 stops
OPO10:55 amPorto
Mar 17
OPO6:20 amPorto
22h 11m
2 stops
SEA9:31 pmSeattle/Tacoma Intl
Delta
Apr 22
SEA11:55 amSeattle/Tacoma Intl
19h 35m
2 stops
OPO3:30 pmPorto
Apr 30
OPO9:15 pmPorto
22h 25m
1 stop
SEA11:40 amSeattle/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 November is, on average, the cheapest month to fly to Porto from Seattle, with most prices found around $825. If you aren’t able to travel during the month of November, then book flights to Porto from Seattle during February instead. Flights to Porto in February, while not as cheap as those in November, still average around $829.

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 24 weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $1,118 when searching 24 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 $919 on momondo.

How have Seattle to Porto flight prices changed over time?

As of February 2025, prices for Seattle to Porto flights are approximately 19% more expensive 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

$389

Fastest flight time

13h 00m

Direct flights

None

Airports in Porto

1 airport
The best one-way flight to Porto from Seattle in the past 72 hours is $389. The best round-trip flight deal from Seattle to Porto found on momondo in the last 72 hours is $593.
The fastest flight from Seattle to Porto takes 13h 00m
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 15m 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
American AirlinesPriceFrom $544Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
British AirwaysPriceFrom $673Free CancellationRating
6.6
6,781 reviews
Search British Airways flights
DeltaPriceFrom $674Free CancellationRating
8.0
8,406 reviews
Search Delta flights
KLMPriceFrom $708Free CancellationRating
7.8
1,334 reviews
Search KLM flights
Turkish AirlinesPriceFrom $759Free CancellationRating
7.3
3,895 reviews
Search Turkish Airlines flights
LufthansaPriceFrom $769Free CancellationRating
6.7
7,031 reviews
Search Lufthansa flights
United AirlinesPriceFrom $873Free CancellationRating
7.4
8,885 reviews
Search United Airlines flights

Traveling to a place near Porto?

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

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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