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Cheap flights from Seattle to Portugal from $306

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.
Icelandair Logo
2:35 pm - 12:45 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
14h 10m1 stop Reykjavik Keflavik Intl
Icelandair Logo
1:55 pm - 5:00 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
35h 05m1 stop Reykjavik Keflavik Intl
$635Icelandair
Mon, Nov 23 - Tue, Dec 8
Icelandair Logo
2:35 pm - 12:45 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
14h 10m1 stop Reykjavik Keflavik Intl
Icelandair Logo
1:55 pm - 5:00 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
35h 05m1 stop Reykjavik Keflavik Intl
$643Icelandair
Mon, Nov 23 - Tue, Dec 8
Lufthansa Logo
6:50 pm - 11:25 pmSEA  Seattle/Tacoma Intl-OPO Porto
20h 35m1 stop Munich Franz Josef Strauss
Lufthansa Logo
6:00 am - 12:20 pmOPO  Porto-SEA Seattle/Tacoma Intl
14h 20m1 stop Frankfurt am Main
$702Lufthansa
Sun, Apr 18 - Wed, Apr 28
Lufthansa Logo
6:50 pm - 11:25 pmSEA  Seattle/Tacoma Intl-OPO Porto
20h 35m1 stop Munich Franz Josef Strauss
Lufthansa Logo
6:00 am - 12:20 pmOPO  Porto-SEA Seattle/Tacoma Intl
14h 20m1 stop Frankfurt am Main
$702Lufthansa
Wed, Apr 7 - Fri, Apr 16
Multiple Airlines Logo
6:50 pm - 11:25 pmSEA  Seattle/Tacoma Intl-OPO Porto
20h 35m1 stop Munich Franz Josef Strauss
Multiple Airlines Logo
6:00 am - 6:23 pmOPO  Porto-SEA Seattle/Tacoma Intl
20h 23m2 stops Frankfurt am Main Vancouver Intl
$702Multiple Airlines
Wed, Apr 7 - Fri, Apr 16
Multiple Airlines Logo
3:15 pm - 11:25 pmSEA  Seattle/Tacoma Intl-OPO Porto
24h 10m2 stops Vancouver Intl Munich Franz Josef Strauss
Multiple Airlines Logo
6:00 am - 9:58 pmOPO  Porto-SEA Seattle/Tacoma Intl
23h 58m2 stops Frankfurt am Main Vancouver Intl
$702Multiple Airlines
Wed, Apr 7 - Fri, Apr 16
Delta Logo
4:35 pm - 10:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
22h 25m1 stop Paris Charles de Gaulle
Delta Logo
11:45 am - 11:33 amOPO  Porto-SEA Seattle/Tacoma Intl
31h 48m1 stop Amsterdam Schiphol
$720Delta
Mon, Mar 15 - Thu, Apr 15
Delta Logo
4:35 pm - 10:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
22h 25m1 stop Paris Charles de Gaulle
Delta Logo
5:00 am - 11:33 amOPO  Porto-SEA Seattle/Tacoma Intl
14h 33m1 stop Amsterdam Schiphol
$720Delta
Mon, Mar 15 - Fri, Apr 16
KLM Logo
5:05 pm - 10:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
21h 55m1 stop Paris Charles de Gaulle
KLM Logo
5:00 am - 11:33 amOPO  Porto-SEA Seattle/Tacoma Intl
14h 33m1 stop Amsterdam Schiphol
$720KLM
Tue, Mar 16 - Fri, Apr 16
KLM Logo
7:27 am - 10:30 amSEA  Seattle/Tacoma Intl-OPO Porto
19h 03m2 stops Chicago O'Hare Intl Amsterdam Schiphol
KLM Logo
5:00 am - 11:50 amOPO  Porto-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
$788KLM
Mon, Nov 30 - Wed, Dec 9

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Delta flights from Seattle to Portugal

Our best Delta deals on Seattle to Portugal flight tickets
Delta
Mar 15
SEA4:35 pmSeattle/Tacoma Intl
22h 25m
1 stop
OPO10:00 pmPorto
Apr 14
OPO11:45 amPorto
31h 48m
1 stop
SEA11:33 amSeattle/Tacoma Intl
$720
Delta
Feb 10
SEA3:30 pmSeattle/Tacoma Intl
22h 30m
1 stop
OPO10:00 pmPorto
Feb 17
OPO5:00 amPorto
14h 50m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$721
Delta
Mar 15
SEA9:30 amSeattle/Tacoma Intl
29h 30m
2 stops
OPO10:00 pmPorto
Apr 14
OPO5:00 amPorto
14h 33m
1 stop
SEA11:33 amSeattle/Tacoma Intl
$724

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Mar 16
SEA8:30 amSeattle/Tacoma Intl
18h 00m
2 stops
OPO9:30 amPorto
Apr 16
OPO6:00 amPorto
14h 20m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$722
United Airlines
Apr 24
SEA7:32 pmSeattle/Tacoma Intl
30h 13m
3 stops
OPO9:45 amPorto
Apr 30
OPO6:00 amPorto
14h 20m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$726
United Airlines
Mar 9
SEA8:30 amSeattle/Tacoma Intl
17h 00m
2 stops
OPO9:30 amPorto
Mar 16
OPO6:00 amPorto
38h 04m
3 stops
SEA1:04 pmSeattle/Tacoma Intl
$729

momondo Fare Finder

 
Use the filters below to find and compare flights from Seattle to Portugal that are best for you.

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Route

Depart

Return

Price

Cheapest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 11/23

2:35 pm-12:45 pm

1 stop14h 10m

Lisbon Humberto Delgado

Tue 12/8

1:55 pm-5:00 pm

1 stop35h 05m

$635

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 11/23

2:35 pm-12:45 pm

1 stop14h 10m

Lisbon Humberto Delgado

Tue 12/8

1:55 pm-5:00 pm

1 stop35h 05m

$643

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 4/18

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Wed 4/28

6:00 am-12:20 pm

1 stop14h 20m

$702

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 4/7

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Fri 4/16

6:00 am-12:20 pm

1 stop14h 20m

$702

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 4/7

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Fri 4/16

6:00 am-6:23 pm

2 stops20h 23m

$702

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 4/7

3:15 pm-11:25 pm

2 stops24h 10m

Porto

Fri 4/16

6:00 am-9:58 pm

2 stops23h 58m

$702

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 3/15

4:35 pm-10:00 pm

1 stop22h 25m

Porto

Thu 4/15

11:45 am-11:33 am

1 stop31h 48m

$720

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 3/15

4:35 pm-10:00 pm

1 stop22h 25m

Porto

Fri 4/16

5:00 am-11:33 am

1 stop14h 33m

$720

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 3/16

5:05 pm-10:00 pm

1 stop21h 55m

Porto

Fri 4/16

5:00 am-11:33 am

1 stop14h 33m

$720
Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 11/30

7:27 am-10:30 am

2 stops19h 03m

Porto

Wed 12/9

5:00 am-11:50 am

1 stop14h 50m

$788

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 $505, 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 $593.

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 $889 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 $810 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 83% 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

Best Price Found

$306

Fastest flight time

14h 00m

Direct flights

None
The best one-way flight to Portugal from Seattle in the past 72 hours is $306. The best round-trip flight deal from Seattle to Portugal found on momondo in the last 72 hours is $635.
The fastest flight from Seattle to Portugal takes 14h 00m
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 $380Free CancellationRating
6.9
767 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.8
1,596 reviews
Search KLM flights
LufthansaPriceFrom $482Free CancellationRating
6.8
8,299 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
8,283 reviews
Search British Airways flights
United AirlinesPriceFrom $482Free CancellationRating
7.3
10,459 reviews
Search United Airlines flights
American AirlinesPriceFrom $497Free CancellationRating
7.0
12,231 reviews
Search American Airlines flights
Air FrancePriceFrom $504Free CancellationRating
7.5
1,648 reviews
Search Air France flights
DeltaPriceFrom $559Free CancellationRating
7.8
8,698 reviews
Search Delta flights
Scandinavian AirlinesPriceFrom $567Free CancellationRating
7.5
2,025 reviews
Search Scandinavian Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,861 reviews
Search Air Canada 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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