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Cheap flights from Seattle to Portugal from $250

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 Portugal departing on 10/27. 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 Portugal

Cheap round-trip flights

Scandinavian Airlines Logo
4:20 pm - 6:45 pmSEA-FAO
18h 25m2 stops
Scandinavian Airlines Logo
7:35 pm - 2:00 pmFAO-SEA
26h 25m2 stops
$508Scandinavian Airlines
Find Deal
Fri, Oct 10 - Sat, Oct 18
Scandinavian Airlines Logo
4:20 pm - 5:55 pmSEA-FAO
17h 35m1 stop
Scandinavian Airlines Logo
7:35 pm - 2:00 pmFAO-SEA
26h 25m2 stops
$547Scandinavian Airlines
Find Deal
Fri, Oct 10 - Sat, Oct 18
United Airlines Logo
3:28 pm - 9:20 amSEA-LIS
33h 52m2 stops
United Airlines Logo
5:05 am - 6:45 pmLIS-SEA
21h 40m2 stops
$604United Airlines
Find Deal
Wed, Oct 15 - Wed, Oct 22
British Airways Logo
6:50 pm - 6:55 pmSEA-LIS
16h 05m1 stop
British Airways Logo
7:00 am - 4:55 pmLIS-SEA
17h 55m1 stop
$613British Airways
Find Deal
Mon, Nov 17 - Thu, Nov 27
Air France Logo
1:30 pm - 2:50 pmSEA-LIS
17h 20m1 stop
Air France Logo
10:40 am - 10:25 pmLIS-SEA
19h 45m1 stop
$615Air France
Find Deal
Thu, Oct 9 - Thu, Nov 20
Delta Logo
1:30 pm - 5:50 pmSEA-LIS
20h 20m1 stop
Delta Logo
5:30 am - 12:25 pmLIS-SEA
13h 55m1 stop
$616Delta
Find Deal
Fri, Oct 17 - Thu, Oct 30
British Airways Logo
6:50 pm - 9:55 amSEA-LIS
31h 05m1 stop
British Airways Logo
7:05 am - 4:55 pmLIS-SEA
17h 50m1 stop
$618British Airways
Find Deal
Fri, Dec 26 - Fri, Jan 9
United Airlines Logo
7:00 am - 8:10 amSEA-LIS
17h 10m2 stops
United Airlines Logo
10:50 am - 10:16 pmLIS-SEA
19h 26m1 stop
$621United Airlines
Find Deal
Sat, Dec 13 - Sun, Dec 21
Delta Logo
1:30 pm - 5:50 pmSEA-LIS
20h 20m1 stop
Delta Logo
5:30 am - 6:39 pmLIS-SEA
21h 09m2 stops
$626Delta
Find Deal
Thu, Oct 9 - Thu, Nov 20
Air France Logo
7:50 am - 10:45 amSEA-LIS
18h 55m1 stop
Air France Logo
5:30 am - 2:20 pmLIS-SEA
15h 50m1 stop
$638Air France
Find Deal
Sat, Oct 18 - Sun, Nov 2

SWISS flights from Seattle to Portugal

Our best SWISS deals on Seattle to Portugal flight tickets
SWISS
Sep 22
SEA2:29 pmSeattle/Tacoma Intl
24h 51m
2 stops
LIS11:20 pmLisbon Humberto Delgado
Oct 16
LIS5:55 amLisbon Humberto Delgado
20h 41m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$681
Find similar
SWISS
Oct 8
SEA1:00 pmSeattle/Tacoma Intl
21h 30m
2 stops
OPO6:30 pmPorto
Oct 29
OPO7:20 pmPorto
34h 55m
2 stops
SEA11:15 pmSeattle/Tacoma Intl
$682
Find similar
SWISS
Sep 24
SEA3:10 pmSeattle/Tacoma Intl
24h 10m
2 stops
LIS11:20 pmLisbon Humberto Delgado
Oct 14
LIS5:55 amLisbon Humberto Delgado
20h 41m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$688
Find similar

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets
Lufthansa
Oct 15
SEA2:20 pmSeattle/Tacoma Intl
23h 45m
1 stop
LIS10:05 pmLisbon Humberto Delgado
Oct 29
LIS6:10 amLisbon Humberto Delgado
15h 10m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
$599
Find similar
Lufthansa
Dec 26
SEA10:05 amSeattle/Tacoma Intl
38h 50m
2 stops
LIS8:55 amLisbon Humberto Delgado
Jan 10
LIS2:10 pmLisbon Humberto Delgado
31h 10m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$606
Find similar
Lufthansa
Mar 14
SEA3:00 pmSeattle/Tacoma Intl
24h 50m
1 stop
LIS10:50 pmLisbon Humberto Delgado
Mar 21
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA1:10 pmSeattle/Tacoma Intl
$609
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Portugal 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, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Seattle to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Fri 10/10

4:20 pm-6:45 pm

2 stops18h 25m

Faro

Sat 10/18

7:35 pm-2:00 pm

2 stops26h 25m

$508

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Fri 10/10

4:20 pm-5:55 pm

1 stop17h 35m

Faro

Sat 10/18

7:35 pm-2:00 pm

2 stops26h 25m

$547

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/15

3:28 pm-9:20 am

2 stops33h 52m

Lisbon Humberto Delgado

Wed 10/22

5:05 am-6:45 pm

2 stops21h 40m

$604

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 11/17

6:50 pm-6:55 pm

1 stop16h 05m

Lisbon Humberto Delgado

Thu 11/27

7:00 am-4:55 pm

1 stop17h 55m

$613

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 10/9

1:30 pm-2:50 pm

1 stop17h 20m

Lisbon Humberto Delgado

Thu 11/20

10:40 am-10:25 pm

1 stop19h 45m

$615

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/17

1:30 pm-5:50 pm

1 stop20h 20m

Lisbon Humberto Delgado

Thu 10/30

5:30 am-12:25 pm

1 stop13h 55m

$616

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 12/26

6:50 pm-9:55 am

1 stop31h 05m

Lisbon Humberto Delgado

Fri 1/9

7:05 am-4:55 pm

1 stop17h 50m

$618

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 12/13

7:00 am-8:10 am

2 stops17h 10m

Lisbon Humberto Delgado

Sun 12/21

10:50 am-10:16 pm

1 stop19h 26m

$621

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 10/9

1:30 pm-5:50 pm

1 stop20h 20m

Lisbon Humberto Delgado

Thu 11/20

5:30 am-6:39 pm

2 stops21h 09m

$626

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 10/18

7:50 am-10:45 am

1 stop18h 55m

Lisbon Humberto Delgado

Sun 11/2

5:30 am-2:20 pm

1 stop15h 50m

$638

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portugal from

How to get the cheapest flight ticket from Seattle to Portugal

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 Portugal?

The cheapest month to fly to Portugal from Seattle is in January. Flight prices, which tend to average around $761, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from Seattle during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $762.

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

According to our data, Monday is the cheapest day to fly to Portugal from Seattle. The lowest ticket price found for a Monday departure recently was $908. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Friday, with ticket prices averaging around $1,111.

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

Our most recent data shows that the best time of day to fly to Portugal is in the afternoon. Flights from Seattle to Portugal during this time can be as low as $959. At noon is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,074 per ticket.

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

You are more likely to see cheaper flights to Portugal from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $944 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from Seattle for as low as $803 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 2% on your flight if you consider stops on a Seattle to Portugal flight.

Cheap Seattle to Portugal flight deals and tips

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

Direct flights

None
There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.
Search flight deals

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

    Prices for flights from Seattle/Tacoma Intl Airport to Portugal were last updated today.

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

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

    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 Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The necessary travel and health documents for your Portugal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Seattle to Portugal

Compare and see reviews for airlines that fly from Seattle to Portugal with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $466Free CancellationRating
7.0
545 reviews
Search Icelandair flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
British AirwaysPriceFrom $563Free CancellationRating
6.7
7,367 reviews
Search British Airways flights
Air FrancePriceFrom $573Free CancellationRating
7.4
1,468 reviews
Search Air France flights
Aer LingusPriceFrom $603Free CancellationRating
7.2
1,277 reviews
Search Aer Lingus flights
United AirlinesPriceFrom $610Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
LufthansaPriceFrom $611Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
American AirlinesPriceFrom $629Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
KLMPriceFrom $632Free CancellationRating
7.8
1,386 reviews
Search KLM flights
DeltaPriceFrom $647Free CancellationRating
7.9
7,961 reviews
Search Delta flights

Why use momondo?

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

It is quick and easy to find Seattle to Portugal flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Portugal that suits you.

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

All flight searches from Seattle to Portugal on momondo can be filtered to show those which offer flexible booking policies.

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

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 Portugal.

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

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

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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Find better results for your trip to Portugal

Popular cities in Portugal

Popular flights according to clicks in the last 7 days on momondo
Flights to Lisbonfrom $358
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Flights to Porto Santofrom $582
Flights to Velasfrom $576