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Cheap flights from Seattle to Portugal from $237

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.
Multiple Airlines Logo
8:00 am - 12:40 am
SEA
-
OPO
32h 40m
3 stops
Multiple Airlines Logo
7:10 pm - 6:32 pm
OPO
-
SEA
31h 22m
3 stops
$693Multiple Airlines
Sat, Sep 5 - Sat, Sep 12
Multiple Airlines Logo
5:40 pm - 9:00 pm
SEA
-
LIS
19h 20m
2 stops
Multiple Airlines Logo
2:00 pm - 4:00 pm
LIS
-
SEA
34h 00m
3 stops
$707Multiple Airlines
Wed, Oct 7 - Wed, Oct 21
Multiple Airlines Logo
5:40 pm - 9:00 pm
SEA
-
LIS
19h 20m
2 stops
Multiple Airlines Logo
9:15 pm - 4:00 pm
LIS
-
SEA
26h 45m
2 stops
$722Multiple Airlines
Wed, Oct 7 - Wed, Oct 21
American Airlines Logo
6:23 am - 11:45 am
SEA
-
OPO
21h 22m
2 stops
American Airlines Logo
8:40 pm - 9:45 am
OPO
-
SEA
21h 05m
2 stops
$764American Airlines
Sun, Oct 18 - Mon, Nov 9
American Airlines Logo
12:00 pm - 4:00 pm
SEA
-
OPO
20h 00m
2 stops
American Airlines Logo
8:20 am - 7:30 pm
OPO
-
SEA
19h 10m
2 stops
$798American Airlines
Sun, Oct 11 - Wed, Oct 21
KLM Logo
2:35 pm - 9:35 am
SEA
-
FNC
35h 00m
1 stop
KLM Logo
11:45 am - 11:47 am
FNC
-
SEA
32h 02m
1 stop
$830KLM
Mon, Nov 9 - Thu, Nov 12
British Airways Logo
7:23 am - 2:15 pm
SEA
-
FNC
22h 52m
2 stops
British Airways Logo
5:00 pm - 11:18 pm
FNC
-
SEA
38h 18m
2 stops
$904British Airways
Mon, Nov 9 - Thu, Nov 12
British Airways Logo
2:46 pm - 2:20 pm
SEA
-
FNC
39h 34m
2 stops
British Airways Logo
5:00 pm - 4:55 pm
FNC
-
SEA
31h 55m
1 stop
$913British Airways
Mon, Nov 9 - Thu, Nov 12
Turkish Airlines Logo
7:05 pm - 11:00 am
SEA
-
TER
56h 55m
2 stops
Turkish Airlines Logo
11:50 am - 5:10 pm
TER
-
SEA
36h 20m
2 stops
$1,567Turkish Airlines
Wed, Dec 2 - Sun, Dec 6
Turkish Airlines Logo
7:05 pm - 11:00 am
SEA
-
TER
56h 55m
2 stops
Turkish Airlines Logo
11:50 am - 5:10 pm
TER
-
SEA
36h 20m
2 stops
$1,657Turkish Airlines
Wed, Dec 2 - Sun, Dec 6

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WestJet flights from Seattle to Portugal

Our best WestJet deals on Seattle to Portugal flight tickets
WestJet
Aug 9
SEA7:00 amSeattle/Tacoma Intl
30h 45m
2 stops
LIS9:45 pmLisbon Humberto Delgado
Aug 24
LIS6:15 amLisbon Humberto Delgado
35h 25m
2 stops
SEA9:40 amSeattle/Tacoma Intl
$765
WestJet
Aug 27
SEA7:00 amSeattle/Tacoma Intl
31h 35m
3 stops
LIS10:35 pmLisbon Humberto Delgado
Sep 8
LIS6:15 amLisbon Humberto Delgado
35h 25m
2 stops
SEA9:40 amSeattle/Tacoma Intl
$769
WestJet
Aug 22
SEA7:00 amSeattle/Tacoma Intl
29h 55m
3 stops
LIS8:55 pmLisbon Humberto Delgado
Aug 31
LIS6:15 amLisbon Humberto Delgado
35h 25m
3 stops
SEA9:40 amSeattle/Tacoma Intl
$782

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets
Lufthansa
Nov 15
SEA2:50 pmSeattle/Tacoma Intl
14h 30m
1 stop
LIS1:20 pmLisbon Humberto Delgado
Nov 25
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$806
Lufthansa
Oct 25
SEA3:50 pmSeattle/Tacoma Intl
14h 30m
1 stop
LIS1:20 pmLisbon Humberto Delgado
Nov 11
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$810
Lufthansa
Oct 25
SEA10:10 amSeattle/Tacoma Intl
17h 50m
2 stops
LIS11:00 amLisbon Humberto Delgado
Nov 11
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$820

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 June 18, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 9/5

8:00 am-12:40 am

3 stops32h 40m

Porto

Sat 9/12

7:10 pm-6:32 pm

3 stops31h 22m

$693

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/7

5:40 pm-9:00 pm

2 stops19h 20m

Lisbon Humberto Delgado

Wed 10/21

2:00 pm-4:00 pm

3 stops34h 00m

$707

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/7

5:40 pm-9:00 pm

2 stops19h 20m

Lisbon Humberto Delgado

Wed 10/21

9:15 pm-4:00 pm

2 stops26h 45m

$722

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/18

6:23 am-11:45 am

2 stops21h 22m

Porto

Mon 11/9

8:40 pm-9:45 am

2 stops21h 05m

$764
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/11

12:00 pm-4:00 pm

2 stops20h 00m

Porto

Wed 10/21

8:20 am-7:30 pm

2 stops19h 10m

$798

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 11/9

2:35 pm-9:35 am

1 stop35h 00m

Funchal Madeira

Thu 11/12

11:45 am-11:47 am

1 stop32h 02m

$830

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 11/9

7:23 am-2:15 pm

2 stops22h 52m

Funchal Madeira

Thu 11/12

5:00 pm-11:18 pm

2 stops38h 18m

$904

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 11/9

2:46 pm-2:20 pm

2 stops39h 34m

Funchal Madeira

Thu 11/12

5:00 pm-4:55 pm

1 stop31h 55m

$913

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Wed 12/2

7:05 pm-11:00 am

2 stops56h 55m

Lajes

Sun 12/6

11:50 am-5:10 pm

2 stops36h 20m

$1,567

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Wed 12/2

7:05 pm-11:00 am

2 stops56h 55m

Lajes

Sun 12/6

11:50 am-5:10 pm

2 stops36h 20m

$1,657

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 $824 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 $726 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 36% 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 55m

Direct flights

None
The fastest flight from Seattle to Portugal takes 12h 55m
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
678 reviews
Search Icelandair flights
LufthansaPriceFrom $482Free CancellationRating
6.8
8,069 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
8,054 reviews
Search British Airways flights
KLMPriceFrom $482Free CancellationRating
7.8
1,530 reviews
Search KLM flights
United AirlinesPriceFrom $488Free CancellationRating
7.4
9,852 reviews
Search United Airlines flights
American AirlinesPriceFrom $497Free CancellationRating
7.1
11,678 reviews
Search American Airlines flights
Air FrancePriceFrom $504Free CancellationRating
7.4
1,608 reviews
Search Air France flights
Aer LingusPriceFrom $535Free CancellationRating
7.3
1,604 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,206 reviews
Search Air Canada flights
DeltaPriceFrom $545Free CancellationRating
7.8
8,409 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

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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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