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Cheap flights from Seattle to Portugal from $236

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 11/25. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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 - 11:10 pm
SEA
-
LIS
18h 50m
1 stop
British Airways Logo
5:10 pm - 11:35 am
LIS
-
SEA
26h 25m
1 stop
$240British Airways
Mon, Sep 21 - Mon, Oct 5
Multiple Airlines Logo
8:00 am - 6:35 pm
SEA
-
LIS
26h 35m
2 stops
Multiple Airlines Logo
6:45 pm - 9:04 pm
LIS
-
SEA
34h 19m
3 stops
$691Multiple Airlines
Wed, Aug 26 - Wed, Sep 9
Multiple Airlines Logo
3:40 pm - 8:30 am
SEA
-
LIS
32h 50m
3 stops
Multiple Airlines Logo
9:25 am - 8:40 pm
LIS
-
SEA
19h 15m
2 stops
$728Multiple Airlines
Mon, Sep 28 - Tue, Oct 6
Lufthansa Logo
2:50 pm - 1:20 pm
SEA
-
LIS
14h 30m
1 stop
Lufthansa Logo
5:00 am - 7:03 pm
LIS
-
SEA
22h 03m
2 stops
$737Lufthansa
Wed, Nov 4 - Wed, Nov 18
Lufthansa Logo
2:50 pm - 1:20 pm
SEA
-
LIS
14h 30m
1 stop
Lufthansa Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$738Lufthansa
Sun, Nov 8 - Wed, Nov 18
Air Canada Logo
7:45 am - 8:55 am
SEA
-
LIS
18h 10m
1 stop
Air Canada Logo
11:20 am - 9:27 am
LIS
-
SEA
30h 07m
2 stops
$743Air Canada
Wed, Oct 28 - Fri, Nov 6
Air Canada Logo
8:40 am - 8:55 am
SEA
-
LIS
17h 15m
2 stops
Air Canada Logo
11:20 am - 9:27 am
LIS
-
SEA
30h 07m
2 stops
$743Air Canada
Wed, Oct 28 - Fri, Nov 6
United Airlines Logo
8:10 am - 10:20 am
SEA
-
LIS
19h 10m
1 stop
United Airlines Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$748United Airlines
Wed, Oct 28 - Thu, Nov 5
United Airlines Logo
6:45 am - 8:10 am
SEA
-
LIS
17h 25m
1 stop
United Airlines Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$748United Airlines
Sun, Nov 8 - Wed, Nov 18
British Airways Logo
6:45 pm - 5:40 pm
SEA
-
LIS
14h 55m
1 stop
British Airways Logo
6:35 pm - 11:25 am
LIS
-
SEA
24h 50m
1 stop
$761British Airways
Wed, Nov 18 - Wed, Dec 2

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Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets
Lufthansa
Nov 4
SEA2:50 pmSeattle/Tacoma Intl
14h 30m
1 stop
LIS1:20 pmLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
22h 03m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$737
Lufthansa
Nov 8
SEA2:50 pmSeattle/Tacoma Intl
14h 30m
1 stop
LIS1:20 pmLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$738
Lufthansa
Nov 4
SEA2:50 pmSeattle/Tacoma Intl
14h 30m
1 stop
LIS1:20 pmLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$739

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Oct 28
SEA8:40 amSeattle/Tacoma Intl
17h 15m
2 stops
LIS8:55 amLisbon Humberto Delgado
Nov 6
LIS11:20 amLisbon Humberto Delgado
30h 07m
2 stops
SEA9:27 amSeattle/Tacoma Intl
$743
Air Canada
Jan 3
SEA7:05 pmSeattle/Tacoma Intl
30h 15m
2 stops
LIS9:20 amLisbon Humberto Delgado
Jan 14
LIS8:55 amLisbon Humberto Delgado
32h 32m
2 stops
SEA9:27 amSeattle/Tacoma Intl
$768
Air Canada
Jan 2
SEA7:05 pmSeattle/Tacoma Intl
30h 15m
2 stops
LIS9:20 amLisbon Humberto Delgado
Jan 13
LIS11:20 amLisbon Humberto Delgado
17h 39m
1 stop
SEA8:59 pmSeattle/Tacoma Intl
$772

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 July 28, 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

Mon 9/21

8:20 pm-11:10 pm

1 stop18h 50m

Lisbon Humberto Delgado

Mon 10/5

5:10 pm-11:35 am

1 stop26h 25m

$240

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 8/26

8:00 am-6:35 pm

2 stops26h 35m

Lisbon Humberto Delgado

Wed 9/9

6:45 pm-9:04 pm

3 stops34h 19m

$691

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 9/28

3:40 pm-8:30 am

3 stops32h 50m

Lisbon Humberto Delgado

Tue 10/6

9:25 am-8:40 pm

2 stops19h 15m

$728

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 11/4

2:50 pm-1:20 pm

1 stop14h 30m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-7:03 pm

2 stops22h 03m

$737
Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 11/8

2:50 pm-1:20 pm

1 stop14h 30m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$738

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/28

7:45 am-8:55 am

1 stop18h 10m

Lisbon Humberto Delgado

Fri 11/6

11:20 am-9:27 am

2 stops30h 07m

$743

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/28

8:40 am-8:55 am

2 stops17h 15m

Lisbon Humberto Delgado

Fri 11/6

11:20 am-9:27 am

2 stops30h 07m

$743

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/28

8:10 am-10:20 am

1 stop19h 10m

Lisbon Humberto Delgado

Thu 11/5

5:00 am-12:00 pm

1 stop15h 00m

$748

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 11/8

6:45 am-8:10 am

1 stop17h 25m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$748

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 11/18

6:45 pm-5:40 pm

1 stop14h 55m

Lisbon Humberto Delgado

Wed 12/2

6:35 pm-11:25 am

1 stop24h 50m

$761

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 $488, 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 $578.

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 $843 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 $728 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 6% 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

12h 40m

Direct flights

None
The fastest flight from Seattle to Portugal takes 12h 40m
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
715 reviews
Search Icelandair flights
LufthansaPriceFrom $475Free CancellationRating
6.8
8,162 reviews
Search Lufthansa flights
KLMPriceFrom $481Free CancellationRating
7.8
1,550 reviews
Search KLM flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
8,127 reviews
Search British Airways flights
United AirlinesPriceFrom $488Free CancellationRating
7.4
10,045 reviews
Search United Airlines flights
American AirlinesPriceFrom $497Free CancellationRating
7.1
11,840 reviews
Search American Airlines flights
Air FrancePriceFrom $505Free CancellationRating
7.5
1,627 reviews
Search Air France flights
Aer LingusPriceFrom $523Free CancellationRating
7.3
1,682 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,398 reviews
Search Air Canada flights
DeltaPriceFrom $550Free CancellationRating
7.8
8,482 reviews
Search Delta 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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