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Cheap flights from Seattle to Portugal from $234

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 4/17. 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.
British Airways Logo
8:20 pm - 11:00 pm
SEA
-
LIS
18h 40m
1 stop
British Airways Logo
11:05 am - 9:23 pm
LIS
-
SEA
18h 18m
1 stop
$511British Airways
Tue, Apr 7 - Wed, Apr 15
Multiple Airlines Logo
8:20 pm - 11:00 pm
SEA
-
LIS
18h 40m
1 stop
Multiple Airlines Logo
12:30 pm - 12:44 am
LIS
-
SEA
20h 14m
2 stops
$514Multiple Airlines
Tue, Apr 7 - Wed, Apr 15
British Airways Logo
1:35 pm - 11:00 pm
SEA
-
LIS
25h 25m
1 stop
British Airways Logo
11:05 am - 9:23 pm
LIS
-
SEA
18h 18m
1 stop
$516British Airways
Tue, Apr 14 - Thu, Apr 23
Air Canada Logo
7:20 pm - 7:00 am
SEA
-
OPO
51h 40m
2 stops
Air Canada Logo
12:15 pm - 10:22 pm
OPO
-
SEA
18h 07m
2 stops
$587Air Canada
Sat, Aug 8 - Tue, Aug 25
Lufthansa Logo
7:20 pm - 7:00 am
SEA
-
OPO
27h 40m
2 stops
Lufthansa Logo
9:00 am - 11:45 pm
OPO
-
SEA
22h 45m
1 stop
$594Lufthansa
Sun, Aug 9 - Tue, Aug 25
Air Canada Logo
7:20 pm - 7:00 am
SEA
-
OPO
51h 40m
2 stops
Air Canada Logo
2:25 pm - 9:07 pm
OPO
-
SEA
38h 42m
2 stops
$596Air Canada
Sat, Aug 8 - Wed, Aug 26
Delta Logo
6:40 pm - 10:00 pm
SEA
-
OPO
19h 20m
1 stop
Delta Logo
5:00 am - 11:40 am
OPO
-
SEA
14h 40m
1 stop
$604Delta
Sun, Apr 19 - Wed, Apr 29
Delta Logo
11:40 am - 10:05 pm
SEA
-
OPO
26h 25m
2 stops
Delta Logo
5:00 am - 11:40 am
OPO
-
SEA
14h 40m
1 stop
$608Delta
Tue, Apr 21 - Wed, Apr 29
United Airlines Logo
1:05 pm - 8:40 am
SEA
-
PDL
12h 35m
1 stop
United Airlines Logo
9:35 am - 7:08 pm
PDL
-
SEA
40h 33m
2 stops
$822United Airlines
Thu, Aug 6 - Fri, Aug 21
United Airlines Logo
1:05 pm - 8:40 am
SEA
-
PDL
12h 35m
1 stop
United Airlines Logo
9:35 am - 9:07 pm
PDL
-
SEA
18h 32m
1 stop
$835United Airlines
Thu, Aug 6 - Fri, Aug 21

Iberia flights from Seattle to Portugal

Our best Iberia deals on Seattle to Portugal flight tickets
Iberia
Apr 12
SEA7:00 amSeattle/Tacoma Intl
20h 50m
2 stops
LIS11:50 amLisbon Humberto Delgado
Apr 22
LIS12:30 pmLisbon Humberto Delgado
20h 14m
2 stops
SEA12:44 amSeattle/Tacoma Intl
$528
Iberia
Apr 12
SEA7:00 amSeattle/Tacoma Intl
20h 50m
2 stops
LIS11:50 amLisbon Humberto Delgado
Apr 22
LIS12:30 pmLisbon Humberto Delgado
20h 14m
2 stops
SEA12:44 amSeattle/Tacoma Intl
$529
Iberia
Apr 15
SEA6:00 amSeattle/Tacoma Intl
22h 25m
2 stops
FNC12:25 pmFunchal Madeira
Apr 22
FNC1:35 pmFunchal Madeira
41h 03m
2 stops
SEA10:38 pmSeattle/Tacoma Intl
$541

Finnair flights from Seattle to Portugal

Our best Finnair deals on Seattle to Portugal flight tickets
Finnair
Apr 7
SEA7:09 amSeattle/Tacoma Intl
32h 16m
2 stops
LIS11:25 pmLisbon Humberto Delgado
Apr 15
LIS6:35 amLisbon Humberto Delgado
24h 03m
2 stops
SEA10:38 pmSeattle/Tacoma Intl
$537
Finnair
Apr 21
SEA7:09 amSeattle/Tacoma Intl
32h 16m
2 stops
LIS11:25 pmLisbon Humberto Delgado
May 2
LIS6:55 pmLisbon Humberto Delgado
32h 41m
2 stops
SEA7:36 pmSeattle/Tacoma Intl
$564
Finnair
Mar 10
SEA6:44 amSeattle/Tacoma Intl
33h 41m
2 stops
LIS11:25 pmLisbon Humberto Delgado
Mar 17
LIS6:30 amLisbon Humberto Delgado
21h 46m
2 stops
SEA9:16 pmSeattle/Tacoma Intl
$710

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 March 4, 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

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 4/7

8:20 pm-11:00 pm

1 stop18h 40m

Lisbon Humberto Delgado

Wed 4/15

11:05 am-9:23 pm

1 stop18h 18m

$511

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 4/7

8:20 pm-11:00 pm

1 stop18h 40m

Lisbon Humberto Delgado

Wed 4/15

12:30 pm-12:44 am

2 stops20h 14m

$514

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 4/14

1:35 pm-11:00 pm

1 stop25h 25m

Lisbon Humberto Delgado

Thu 4/23

11:05 am-9:23 pm

1 stop18h 18m

$516

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/8

7:20 pm-7:00 am

2 stops51h 40m

Porto

Tue 8/25

12:15 pm-10:22 pm

2 stops18h 07m

$587

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 8/9

7:20 pm-7:00 am

2 stops27h 40m

Porto

Tue 8/25

9:00 am-11:45 pm

1 stop22h 45m

$594

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/8

7:20 pm-7:00 am

2 stops51h 40m

Porto

Wed 8/26

2:25 pm-9:07 pm

2 stops38h 42m

$596

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 4/19

6:40 pm-10:00 pm

1 stop19h 20m

Porto

Wed 4/29

5:00 am-11:40 am

1 stop14h 40m

$604

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 4/21

11:40 am-10:05 pm

2 stops26h 25m

Porto

Wed 4/29

5:00 am-11:40 am

1 stop14h 40m

$608

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Thu 8/6

1:05 pm-8:40 am

1 stop12h 35m

Ponta Delgada Nordela

Fri 8/21

9:35 am-7:08 pm

2 stops40h 33m

$822

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Thu 8/6

1:05 pm-8:40 am

1 stop12h 35m

Ponta Delgada Nordela

Fri 8/21

9:35 am-9:07 pm

1 stop18h 32m

$835

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 $492, 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 $560.

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 $822 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.

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

12h 35m

Direct flights

None
The fastest flight from Seattle to Portugal takes 12h 35m
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
617 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,465 reviews
Search KLM flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
7,775 reviews
Search British Airways flights
LufthansaPriceFrom $484Free CancellationRating
6.8
7,823 reviews
Search Lufthansa flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,388 reviews
Search United Airlines flights
Air FrancePriceFrom $530Free CancellationRating
7.4
1,542 reviews
Search Air France flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,776 reviews
Search Air Canada flights
DeltaPriceFrom $545Free CancellationRating
7.9
8,246 reviews
Search Delta flights
American AirlinesPriceFrom $558Free CancellationRating
7.1
11,380 reviews
Search American Airlines flights
SWISSPriceFrom $562Free CancellationRating
7.6
1,889 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

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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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