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Cheap flights from Seattle to Portugal from $270

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 1/14. 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 Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:25 pm - 11:10 amSEA-OPO
35h 45m2 stops
Multiple Airlines Logo
2:05 pm - 1:20 pmOPO-SEA
31h 15m1 stop
$449Multiple Airlines
Find Deal
Thu, Dec 4 - Thu, Dec 11
Multiple Airlines Logo
1:05 pm - 11:10 amSEA-OPO
38h 05m2 stops
Multiple Airlines Logo
2:05 pm - 1:20 pmOPO-SEA
31h 15m1 stop
$450Multiple Airlines
Find Deal
Thu, Dec 4 - Thu, Dec 11
Lufthansa Logo
3:40 pm - 11:40 pmSEA-OPO
48h 00m2 stops
Lufthansa Logo
6:30 am - 1:20 pmOPO-SEA
14h 50m1 stop
$477Lufthansa
Find Deal
Thu, Dec 4 - Fri, Dec 12
Delta Logo
7:20 am - 10:30 amSEA-OPO
19h 10m2 stops
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$481Delta
Find Deal
Fri, Dec 5 - Wed, Dec 10
Delta Logo
3:05 pm - 3:25 pmSEA-OPO
16h 20m1 stop
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$482Delta
Find Deal
Thu, Dec 4 - Wed, Dec 10
Lufthansa Logo
3:40 pm - 11:40 pmSEA-OPO
48h 00m2 stops
Lufthansa Logo
6:00 am - 8:54 pmOPO-SEA
22h 54m2 stops
$485Lufthansa
Find Deal
Thu, Dec 4 - Wed, Dec 10
United Airlines Logo
3:00 pm - 2:50 pmSEA-LIS
16h 50m1 stop
United Airlines Logo
5:00 am - 1:10 pmLIS-SEA
15h 10m1 stop
$496United Airlines
Find Deal
Mon, Mar 16 - Thu, Mar 26
United Airlines Logo
11:59 pm - 11:40 amSEA-OPO
27h 41m2 stops
United Airlines Logo
6:00 am - 11:30 amOPO-SEA
37h 30m2 stops
$502United Airlines
Find Deal
Mon, Dec 29 - Tue, Jan 20
British Airways Logo
6:50 pm - 7:00 pmSEA-OPO
16h 10m1 stop
British Airways Logo
5:35 pm - 11:30 amOPO-SEA
25h 55m1 stop
$530British Airways
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Fri, Dec 5 - Thu, Dec 11
British Airways Logo
6:50 pm - 11:30 amSEA-FNC
32h 40m1 stop
British Airways Logo
3:55 pm - 5:55 pmFNC-SEA
33h 00m1 stop
$557British Airways
Find Deal
Sat, Feb 28 - Wed, Mar 18

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Dec 3
SEA8:10 amSeattle/Tacoma Intl
43h 00m
2 stops
OPO11:10 amPorto
Dec 12
OPO6:30 amPorto
35h 01m
2 stops
SEA9:31 amSeattle/Tacoma Intl
$486
Find similar
Air Canada
Dec 3
SEA8:10 amSeattle/Tacoma Intl
43h 00m
2 stops
OPO11:10 amPorto
Dec 11
OPO6:00 amPorto
24h 16m
2 stops
SEA10:16 pmSeattle/Tacoma Intl
$490
Find similar
Air Canada
Jan 7
SEA10:05 amSeattle/Tacoma Intl
39h 15m
2 stops
LIS9:20 amLisbon Humberto Delgado
Jan 19
LIS11:20 amLisbon Humberto Delgado
18h 56m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$497
Find similar

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Mar 16
SEA3:00 pmSeattle/Tacoma Intl
16h 50m
1 stop
LIS2:50 pmLisbon Humberto Delgado
Mar 26
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA1:10 pmSeattle/Tacoma Intl
$496
Find similar
United Airlines
Dec 29
SEA11:59 pmSeattle/Tacoma Intl
27h 41m
2 stops
OPO11:40 amPorto
Jan 20
OPO6:00 amPorto
37h 30m
2 stops
SEA11:30 amSeattle/Tacoma Intl
$502
Find similar
United Airlines
Jan 11
SEA8:10 amSeattle/Tacoma Intl
17h 10m
1 stop
LIS9:20 amLisbon Humberto Delgado
Jan 19
LIS11:20 amLisbon Humberto Delgado
18h 56m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$504
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 November 6, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 12/4

3:25 pm-11:10 am

2 stops35h 45m

Porto

Thu 12/11

2:05 pm-1:20 pm

1 stop31h 15m

$449

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 12/4

1:05 pm-11:10 am

2 stops38h 05m

Porto

Thu 12/11

2:05 pm-1:20 pm

1 stop31h 15m

$450

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 12/4

3:40 pm-11:40 pm

2 stops48h 00m

Porto

Fri 12/12

6:30 am-1:20 pm

1 stop14h 50m

$477

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 12/5

7:20 am-10:30 am

2 stops19h 10m

Porto

Wed 12/10

11:15 am-11:50 am

1 stop32h 35m

$481

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 12/4

3:05 pm-3:25 pm

1 stop16h 20m

Porto

Wed 12/10

11:15 am-11:50 am

1 stop32h 35m

$482

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 12/4

3:40 pm-11:40 pm

2 stops48h 00m

Porto

Wed 12/10

6:00 am-8:54 pm

2 stops22h 54m

$485

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 3/16

3:00 pm-2:50 pm

1 stop16h 50m

Lisbon Humberto Delgado

Thu 3/26

5:00 am-1:10 pm

1 stop15h 10m

$496

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 12/29

11:59 pm-11:40 am

2 stops27h 41m

Porto

Tue 1/20

6:00 am-11:30 am

2 stops37h 30m

$502

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 12/5

6:50 pm-7:00 pm

1 stop16h 10m

Porto

Thu 12/11

5:35 pm-11:30 am

1 stop25h 55m

$530

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Sat 2/28

6:50 pm-11:30 am

1 stop32h 40m

Funchal Madeira

Wed 3/18

3:55 pm-5:55 pm

1 stop33h 00m

$557

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 $711, 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 November instead. Flights to Portugal in November, while not as cheap as those in January, still average around $731.

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 $919 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 $795 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 14% 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 $358Free CancellationRating
7.1
572 reviews
Search Icelandair flights
LufthansaPriceFrom $517Free CancellationRating
6.8
7,558 reviews
Search Lufthansa flights
British AirwaysPriceFrom $534Free CancellationRating
6.7
7,500 reviews
Search British Airways flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,416 reviews
Search Air Canada flights
United AirlinesPriceFrom $543Free CancellationRating
7.4
9,007 reviews
Search United Airlines flights
Air FrancePriceFrom $560Free CancellationRating
7.4
1,484 reviews
Search Air France flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,779 reviews
Search SWISS flights
KLMPriceFrom $566Free CancellationRating
7.7
1,405 reviews
Search KLM flights
American AirlinesPriceFrom $621Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
Aer LingusPriceFrom $627Free CancellationRating
7.2
1,365 reviews
Search Aer Lingus 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

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Popular flights according to clicks in the last 7 days on momondo
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