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Cheap flights from Seattle to Portugal from $298

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 5/4. 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
3:55 pm - 8:40 pm
SEA
-
LIS
20h 45m
1 stop
Multiple Airlines Logo
4:25 pm - 1:45 pm
LIS
-
SEA
29h 20m
1 stop
$720Multiple Airlines
Fri, Oct 2 - Sat, Oct 10
Scandinavian Airlines Logo
3:55 pm - 5:05 pm
SEA
-
OPO
17h 10m
1 stop
Scandinavian Airlines Logo
11:50 am - 1:45 pm
OPO
-
SEA
33h 55m
1 stop
$737Scandinavian Airlines
Sat, Aug 22 - Thu, Sep 3
Multiple Airlines Logo
3:55 pm - 8:40 pm
SEA
-
LIS
20h 45m
1 stop
Multiple Airlines Logo
4:25 pm - 1:45 pm
LIS
-
SEA
29h 20m
1 stop
$738Multiple Airlines
Fri, Oct 2 - Sat, Oct 10
Turkish Airlines Logo
7:10 pm - 11:20 pm
SEA
-
LIS
20h 10m
1 stop
Turkish Airlines Logo
5:55 am - 5:15 pm
LIS
-
SEA
19h 20m
1 stop
$744Turkish Airlines
Tue, Oct 6 - Tue, Oct 20
British Airways Logo
1:30 pm - 7:05 pm
SEA
-
OPO
21h 35m
1 stop
British Airways Logo
8:20 am - 12:15 am
OPO
-
SEA
23h 55m
2 stops
$795British Airways
Wed, Oct 7 - Fri, Oct 23
United Airlines Logo
7:00 am - 9:45 am
SEA
-
OPO
18h 45m
1 stop
United Airlines Logo
12:30 pm - 12:14 am
OPO
-
SEA
19h 44m
2 stops
$812United Airlines
Wed, Oct 21 - Wed, Dec 16
KLM Logo
1:55 pm - 7:25 pm
SEA
-
FAO
21h 30m
1 stop
KLM Logo
8:20 pm - 4:24 pm
FAO
-
SEA
28h 04m
1 stop
$972KLM
Mon, Jun 1 - Wed, Jun 10
KLM Logo
1:45 pm - 9:35 am
SEA
-
FNC
35h 50m
1 stop
KLM Logo
6:40 pm - 11:52 am
FNC
-
SEA
25h 12m
1 stop
$985KLM
Mon, Oct 5 - Sun, Oct 11
British Airways Logo
1:30 pm - 6:35 pm
SEA
-
FNC
21h 05m
1 stop
British Airways Logo
7:35 pm - 11:35 am
FNC
-
SEA
24h 00m
1 stop
$996British Airways
Mon, Oct 5 - Tue, Oct 13
Air Canada Logo
10:30 am - 11:15 pm
SEA
-
TER
29h 45m
3 stops
Air Canada Logo
7:05 am - 10:42 pm
TER
-
SEA
22h 37m
3 stops
$9,588Air Canada
Tue, Sep 15 - Tue, Sep 29

Turkish Airlines flights from Seattle to Portugal

Our best Turkish Airlines deals on Seattle to Portugal flight tickets
Turkish Airlines
Oct 6
SEA7:10 pmSeattle/Tacoma Intl
20h 10m
1 stop
LIS11:20 pmLisbon Humberto Delgado
Oct 20
LIS5:55 amLisbon Humberto Delgado
19h 20m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$744
Turkish Airlines
Oct 5
SEA7:10 pmSeattle/Tacoma Intl
36h 30m
1 stop
LIS3:40 pmLisbon Humberto Delgado
Oct 16
LIS11:00 amLisbon Humberto Delgado
38h 15m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$784
Turkish Airlines
Aug 25
SEA7:10 pmSeattle/Tacoma Intl
20h 10m
1 stop
LIS11:20 pmLisbon Humberto Delgado
Sep 16
LIS5:55 amLisbon Humberto Delgado
19h 20m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$788

Scandinavian Airlines flights from Seattle to Portugal

Our best Scandinavian Airlines deals on Seattle to Portugal flight tickets
Scandinavian Airlines
Aug 25
SEA3:55 pmSeattle/Tacoma Intl
35h 05m
1 stop
OPO11:00 amPorto
Sep 3
OPO11:50 amPorto
33h 55m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$787
Scandinavian Airlines
Aug 14
SEA3:55 pmSeattle/Tacoma Intl
33h 05m
1 stop
LIS9:00 amLisbon Humberto Delgado
Aug 22
LIS4:25 pmLisbon Humberto Delgado
29h 20m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$793
Scandinavian Airlines
Oct 2
SEA2:30 pmSeattle/Tacoma Intl
34h 30m
2 stops
LIS9:00 amLisbon Humberto Delgado
Oct 10
LIS4:25 pmLisbon Humberto Delgado
29h 20m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$801

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 April 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

Cheapest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/2

3:55 pm-8:40 pm

1 stop20h 45m

Lisbon Humberto Delgado

Sat 10/10

4:25 pm-1:45 pm

1 stop29h 20m

$720

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/22

3:55 pm-5:05 pm

1 stop17h 10m

Porto

Thu 9/3

11:50 am-1:45 pm

1 stop33h 55m

$737

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/2

3:55 pm-8:40 pm

1 stop20h 45m

Lisbon Humberto Delgado

Sat 10/10

4:25 pm-1:45 pm

1 stop29h 20m

$738

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/6

7:10 pm-11:20 pm

1 stop20h 10m

Lisbon Humberto Delgado

Tue 10/20

5:55 am-5:15 pm

1 stop19h 20m

$744

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/7

1:30 pm-7:05 pm

1 stop21h 35m

Porto

Fri 10/23

8:20 am-12:15 am

2 stops23h 55m

$795
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/21

7:00 am-9:45 am

1 stop18h 45m

Porto

Wed 12/16

12:30 pm-12:14 am

2 stops19h 44m

$812

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Mon 6/1

1:55 pm-7:25 pm

1 stop21h 30m

Faro

Wed 6/10

8:20 pm-4:24 pm

1 stop28h 04m

$972

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 10/5

1:45 pm-9:35 am

1 stop35h 50m

Funchal Madeira

Sun 10/11

6:40 pm-11:52 am

1 stop25h 12m

$985

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 10/5

1:30 pm-6:35 pm

1 stop21h 05m

Funchal Madeira

Tue 10/13

7:35 pm-11:35 am

1 stop24h 00m

$996

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Tue 9/15

10:30 am-11:15 pm

3 stops29h 45m

Lajes

Tue 9/29

7:05 am-10:42 pm

3 stops22h 37m

$9,588

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 $339, 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 April instead. Flights to Portugal in April, while not as cheap as those in January, still average around $390.

How far in advance should I book a flight from Seattle 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 $814 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 $727 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 40% 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 35m

Direct flights

None
The fastest flight from Seattle to Portugal takes 13h 35m
There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.
Search flight deals

Frequently asked questions about flying from Seattle to Portugal

  • 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
7.0
646 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.8
1,510 reviews
Search KLM flights
LufthansaPriceFrom $482Free CancellationRating
6.8
7,959 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
7,931 reviews
Search British Airways flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,680 reviews
Search United Airlines flights
Air FrancePriceFrom $530Free CancellationRating
7.4
1,580 reviews
Search Air France flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,979 reviews
Search Air Canada flights
DeltaPriceFrom $545Free CancellationRating
7.9
8,467 reviews
Search Delta flights
Aer LingusPriceFrom $553Free CancellationRating
7.3
1,536 reviews
Search Aer Lingus flights
American AirlinesPriceFrom $558Free CancellationRating
7.1
11,680 reviews
Search American Airlines 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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