Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Portugal from $255

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 5/19. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:00 am - 6:30 pm
SEA
-
OPO
26h 30m
2 stops
Multiple Airlines Logo
1:45 pm - 1:20 pm
OPO
-
SEA
31h 35m
1 stop
$478Multiple Airlines
Tue, Feb 24 - Tue, Mar 3
Multiple Airlines Logo
8:00 am - 6:30 pm
SEA
-
OPO
26h 30m
2 stops
Multiple Airlines Logo
1:45 pm - 1:20 pm
OPO
-
SEA
31h 35m
1 stop
$479Multiple Airlines
Tue, Feb 24 - Tue, Mar 3
Iberia Logo
6:44 am - 7:40 am
SEA
-
OPO
16h 56m
2 stops
Iberia Logo
8:20 am - 11:04 pm
OPO
-
SEA
22h 44m
2 stops
$481Iberia
Tue, Feb 24 - Tue, Mar 3
United Airlines Logo
8:17 am - 10:15 am
SEA
-
LIS
17h 58m
1 stop
United Airlines Logo
5:00 am - 1:10 pm
LIS
-
SEA
15h 10m
1 stop
$484United Airlines
Sun, Mar 1 - Tue, Mar 17
Delta Logo
8:00 am - 10:30 am
SEA
-
OPO
18h 30m
2 stops
Delta Logo
5:00 am - 11:35 am
OPO
-
SEA
14h 35m
1 stop
$484Delta
Tue, Feb 24 - Tue, Mar 3
Lufthansa Logo
3:10 pm - 1:20 pm
SEA
-
LIS
14h 10m
1 stop
Lufthansa Logo
5:00 am - 1:10 pm
LIS
-
SEA
15h 10m
1 stop
$486Lufthansa
Fri, Feb 27 - Tue, Mar 10
United Airlines Logo
9:00 am - 9:30 am
SEA
-
OPO
16h 30m
2 stops
United Airlines Logo
12:30 pm - 12:59 am
OPO
-
SEA
20h 29m
2 stops
$487United Airlines
Tue, Feb 24 - Tue, Mar 3
Delta Logo
7:20 am - 8:00 am
SEA
-
LIS
16h 40m
1 stop
Delta Logo
5:00 am - 11:45 am
LIS
-
SEA
14h 45m
1 stop
$487Delta
Sun, Apr 19 - Wed, Apr 29
British Airways Logo
1:35 pm - 5:55 pm
SEA
-
LIS
20h 20m
1 stop
British Airways Logo
11:05 am - 9:57 pm
LIS
-
SEA
17h 52m
1 stop
$491British Airways
Sat, Feb 28 - Tue, Mar 10
British Airways Logo
6:50 pm - 3:55 pm
SEA
-
FNC
37h 05m
1 stop
British Airways Logo
4:00 pm - 5:55 pm
FNC
-
SEA
32h 55m
1 stop
$541British Airways
Thu, Feb 26 - Wed, Mar 11

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Mar 1
SEA8:17 amSeattle/Tacoma Intl
17h 58m
1 stop
LIS10:15 amLisbon Humberto Delgado
Mar 17
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA1:10 pmSeattle/Tacoma Intl
$484
United Airlines
Feb 24
SEA9:00 amSeattle/Tacoma Intl
16h 30m
2 stops
OPO9:30 amPorto
Mar 3
OPO12:30 pmPorto
20h 29m
2 stops
SEA12:59 amSeattle/Tacoma Intl
$487
United Airlines
Feb 25
SEA7:00 amSeattle/Tacoma Intl
17h 10m
2 stops
LIS8:10 amLisbon Humberto Delgado
Mar 4
LIS6:10 amLisbon Humberto Delgado
15h 10m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$488

Finnair flights from Seattle to Portugal

Our best Finnair deals on Seattle to Portugal flight tickets
Finnair
Apr 21
SEA7:00 amSeattle/Tacoma Intl
32h 25m
2 stops
LIS11:25 pmLisbon Humberto Delgado
May 2
LIS6:35 amLisbon Humberto Delgado
23h 51m
2 stops
SEA10:26 pmSeattle/Tacoma Intl
$528
Finnair
Apr 21
SEA7:00 amSeattle/Tacoma Intl
32h 25m
2 stops
LIS11:25 pmLisbon Humberto Delgado
May 2
LIS6:35 amLisbon Humberto Delgado
23h 51m
2 stops
SEA10:26 pmSeattle/Tacoma Intl
$530

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 January 29, 2026.
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

Tue 2/24

8:00 am-6:30 pm

2 stops26h 30m

Porto

Tue 3/3

1:45 pm-1:20 pm

1 stop31h 35m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

8:00 am-6:30 pm

2 stops26h 30m

Porto

Tue 3/3

1:45 pm-1:20 pm

1 stop31h 35m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

6:44 am-7:40 am

2 stops16h 56m

Porto

Tue 3/3

8:20 am-11:04 pm

2 stops22h 44m

$481

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 3/1

8:17 am-10:15 am

1 stop17h 58m

Lisbon Humberto Delgado

Tue 3/17

5:00 am-1:10 pm

1 stop15h 10m

$484

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

8:00 am-10:30 am

2 stops18h 30m

Porto

Tue 3/3

5:00 am-11:35 am

1 stop14h 35m

$484

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 2/27

3:10 pm-1:20 pm

1 stop14h 10m

Lisbon Humberto Delgado

Tue 3/10

5:00 am-1:10 pm

1 stop15h 10m

$486

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

9:00 am-9:30 am

2 stops16h 30m

Porto

Tue 3/3

12:30 pm-12:59 am

2 stops20h 29m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 4/19

7:20 am-8:00 am

1 stop16h 40m

Lisbon Humberto Delgado

Wed 4/29

5:00 am-11:45 am

1 stop14h 45m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 2/28

1:35 pm-5:55 pm

1 stop20h 20m

Lisbon Humberto Delgado

Tue 3/10

11:05 am-9:57 pm

1 stop17h 52m

$491

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 2/26

6:50 pm-3:55 pm

1 stop37h 05m

Funchal Madeira

Wed 3/11

4:00 pm-5:55 pm

1 stop32h 55m

$541

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $504, 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 $594.

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 $839 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 $742 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 19% 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

Fastest flight time

13h 40m

Direct flights

None
The fastest flight from Seattle to Portugal takes 13h 40m
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 $348Free CancellationRating
7.1
606 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,443 reviews
Search KLM flights
British AirwaysPriceFrom $486Free CancellationRating
6.7
7,705 reviews
Search British Airways flights
LufthansaPriceFrom $488Free CancellationRating
6.8
7,756 reviews
Search Lufthansa flights
United AirlinesPriceFrom $498Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,667 reviews
Search Air Canada flights
Air FrancePriceFrom $546Free CancellationRating
7.4
1,528 reviews
Search Air France flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,206 reviews
Search American Airlines flights
DeltaPriceFrom $561Free CancellationRating
7.9
8,127 reviews
Search Delta flights
SWISSPriceFrom $562Free CancellationRating
7.6
1,864 reviews
Search SWISS 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
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 2/28
Sat 3/7
By creating a price alert you accept our terms of use and privacy policy.

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 $365
Flights to Portofrom $342
Flights to Funchalfrom $376
Flights to Farofrom $364
Flights to Ponta Delgadafrom $391
Flights to Lajesfrom $398
Flights to Hortafrom $577
Flights to Pico Islandfrom $561
Flights to Porto Santofrom $392
Flights to Velasfrom $575