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Cheap flights from Seattle to Portugal from $261

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 2/7. 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
1:40 pm - 2:35 pmSEA-OPO
16h 55m1 stop
Multiple Airlines Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$477Multiple Airlines
Find Deal
jue., ene. 1 - jue., ene. 15
KLM Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
KLM Logo
4:10 pm - 11:50 amOPO-SEA
27h 40m1 stop
$478KLM
Find Deal
mar., ene. 13 - mar., ene. 20
Delta Logo
2:10 pm - 10:30 amSEA-OPO
36h 20m1 stop
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$479Delta
Find Deal
lun., ene. 12 - mié., ene. 21
Delta Logo
3:10 pm - 10:30 amSEA-OPO
35h 20m1 stop
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$483Delta
Find Deal
jue., ene. 22 - lun., ene. 26
Lufthansa Logo
3:10 pm - 1:15 pmSEA-OPO
14h 05m1 stop
Lufthansa Logo
6:00 am - 10:43 pmOPO-SEA
24h 43m2 stops
$487Lufthansa
Find Deal
mié., ene. 7 - dom., ene. 18
Lufthansa Logo
3:10 pm - 1:15 pmSEA-OPO
14h 05m1 stop
Lufthansa Logo
6:00 am - 6:14 pmOPO-SEA
20h 14m2 stops
$488Lufthansa
Find Deal
mié., ene. 14 - sáb., ene. 24
Air Canada Logo
8:10 am - 1:15 pmSEA-OPO
21h 05m2 stops
Air Canada Logo
6:00 am - 10:16 pmOPO-SEA
24h 16m2 stops
$491Air Canada
Find Deal
mié., ene. 14 - jue., ene. 22
United Airlines Logo
7:00 am - 8:10 amSEA-LIS
17h 10m2 stops
United Airlines Logo
11:20 am - 11:49 amLIS-SEA
32h 29m2 stops
$494United Airlines
Find Deal
lun., feb. 9 - lun., feb. 23
United Airlines Logo
8:10 am - 8:10 amSEA-LIS
16h 00m2 stops
United Airlines Logo
5:00 am - 12:10 pmLIS-SEA
15h 10m1 stop
$495United Airlines
Find Deal
mié., dic. 3 - jue., dic. 11
Air Canada Logo
8:00 pm - 7:55 amSEA-LIS
27h 55m2 stops
Air Canada Logo
11:20 am - 10:16 pmLIS-SEA
41h 56m2 stops
$496Air Canada
Find Deal
mié., mar. 4 - jue., mar. 12

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Nov 26
SEA8:10 amSeattle/Tacoma Intl
16h 45m
1 stop
LIS8:55 amLisbon Humberto Delgado
Dec 4
LIS10:55 amLisbon Humberto Delgado
42h 05m
3 stops
SEA9:00 pmSeattle/Tacoma Intl
$494
Find similar
United Airlines
Dec 3
SEA8:10 amSeattle/Tacoma Intl
16h 00m
2 stops
LIS8:10 amLisbon Humberto Delgado
Dec 11
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$495
Find similar
United Airlines
Jan 22
SEA2:00 pmSeattle/Tacoma Intl
16h 45m
1 stop
OPO2:45 pmPorto
Jan 26
OPO6:00 amPorto
24h 43m
3 stops
SEA10:43 pmSeattle/Tacoma Intl
$499
Find similar

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Mar 4
SEA8:00 pmSeattle/Tacoma Intl
27h 55m
2 stops
LIS7:55 amLisbon Humberto Delgado
Mar 12
LIS11:20 amLisbon Humberto Delgado
41h 56m
2 stops
SEA10:16 pmSeattle/Tacoma Intl
$496
Find similar
Air Canada
Jan 7
SEA8:00 pmSeattle/Tacoma Intl
29h 20m
2 stops
LIS9:20 amLisbon Humberto Delgado
Jan 18
LIS10:50 amLisbon Humberto Delgado
19h 26m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$497
Find similar
Air Canada
Dec 3
SEA5:50 amSeattle/Tacoma Intl
19h 05m
2 stops
LIS8:55 amLisbon Humberto Delgado
Dec 9
LIS5:00 amLisbon Humberto Delgado
25h 16m
2 stops
SEA10:16 pmSeattle/Tacoma Intl
$499
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 noviembre 20, 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

jue. 1/1

1:40 pm-2:35 pm

1 stop16h 55m

Porto

jue. 1/15

11:15 am-11:50 am

1 stop32h 35m

$477

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 1/13

1:40 pm-10:30 am

1 stop12h 50m

Porto

mar. 1/20

4:10 pm-11:50 am

1 stop27h 40m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun. 1/12

2:10 pm-10:30 am

1 stop36h 20m

Porto

mié. 1/21

11:15 am-11:50 am

1 stop32h 35m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

jue. 1/22

3:10 pm-10:30 am

1 stop35h 20m

Porto

lun. 1/26

11:15 am-11:50 am

1 stop32h 35m

$483

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mié. 1/7

3:10 pm-1:15 pm

1 stop14h 05m

Porto

dom. 1/18

6:00 am-10:43 pm

2 stops24h 43m

$487

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mié. 1/14

3:10 pm-1:15 pm

1 stop14h 05m

Porto

sáb. 1/24

6:00 am-6:14 pm

2 stops20h 14m

$488

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mié. 1/14

8:10 am-1:15 pm

2 stops21h 05m

Porto

jue. 1/22

6:00 am-10:16 pm

2 stops24h 16m

$491

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

lun. 2/9

7:00 am-8:10 am

2 stops17h 10m

Lisbon Humberto Delgado

lun. 2/23

11:20 am-11:49 am

2 stops32h 29m

$494

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mié. 12/3

8:10 am-8:10 am

2 stops16h 00m

Lisbon Humberto Delgado

jue. 12/11

5:00 am-12:10 pm

1 stop15h 10m

$495

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mié. 3/4

8:00 pm-7:55 am

2 stops27h 55m

Lisbon Humberto Delgado

jue. 3/12

11:20 am-10:16 pm

2 stops41h 56m

$496

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 November. Flight prices, which tend to average around $641, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Portugal from Seattle during January instead. Flights to Portugal in January, while not as cheap as those in November, still average around $705.

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 $901 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 $774 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
7.0
581 reviews
Search Icelandair flights
LufthansaPriceFrom $517Free CancellationRating
6.8
7,579 reviews
Search Lufthansa flights
British AirwaysPriceFrom $534Free CancellationRating
6.7
7,533 reviews
Search British Airways flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,462 reviews
Search Air Canada flights
United AirlinesPriceFrom $543Free CancellationRating
7.4
9,027 reviews
Search United Airlines flights
Air FrancePriceFrom $560Free CancellationRating
7.4
1,493 reviews
Search Air France flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,788 reviews
Search SWISS flights
KLMPriceFrom $566Free CancellationRating
7.7
1,412 reviews
Search KLM flights
American AirlinesPriceFrom $621Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
Aer LingusPriceFrom $627Free CancellationRating
7.2
1,377 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.
Start using Trips
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Find better results for your trip to Portugal

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