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Cheap flights from Seattle to Portugal from $215

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 10/28. 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.
Icelandair Logo
7:00 pm - 1:50 pm
SEA
-
LIS
34h 50m
1 stop
Icelandair Logo
3:00 pm - 5:55 pm
LIS
-
SEA
34h 55m
1 stop
$604Icelandair
Fri, Oct 2 - Sun, Oct 18
Multiple Airlines Logo
3:40 pm - 9:20 pm
SEA
-
OPO
21h 40m
2 stops
Multiple Airlines Logo
9:15 pm - 8:40 pm
OPO
-
SEA
31h 25m
3 stops
$606Multiple Airlines
Sun, Sep 27 - Mon, Oct 12
Multiple Airlines Logo
3:40 pm - 8:20 pm
SEA
-
LIS
20h 40m
2 stops
Multiple Airlines Logo
9:25 am - 8:40 pm
LIS
-
SEA
19h 15m
2 stops
$606Multiple Airlines
Fri, Oct 2 - Tue, Oct 13
United Airlines Logo
11:00 pm - 8:05 am
SEA
-
FNC
25h 05m
2 stops
United Airlines Logo
9:40 am - 6:41 pm
FNC
-
SEA
17h 01m
1 stop
$881United Airlines
Mon, Aug 17 - Wed, Sep 2
United Airlines Logo
7:30 am - 8:05 am
SEA
-
FNC
16h 35m
1 stop
United Airlines Logo
9:40 am - 11:36 pm
FNC
-
SEA
21h 56m
1 stop
$954United Airlines
Tue, Sep 8 - Fri, Sep 18
British Airways Logo
6:45 pm - 11:10 am
SEA
-
FNC
32h 25m
1 stop
British Airways Logo
12:25 pm - 4:55 pm
FNC
-
SEA
36h 30m
1 stop
$976British Airways
Tue, Dec 29 - Mon, Jan 11
KLM Logo
2:35 pm - 9:35 am
SEA
-
FNC
35h 00m
1 stop
KLM Logo
10:10 am - 10:35 am
FNC
-
SEA
32h 25m
2 stops
$981KLM
Mon, Dec 28 - Sun, Jan 10
British Airways Logo
10:31 am - 11:10 am
SEA
-
FNC
40h 39m
2 stops
British Airways Logo
12:25 pm - 11:25 am
FNC
-
SEA
31h 00m
1 stop
$1,012British Airways
Tue, Dec 29 - Mon, Jan 11
Air Canada Logo
7:45 am - 11:15 pm
SEA
-
TER
32h 30m
2 stops
Air Canada Logo
12:35 pm - 8:59 pm
TER
-
SEA
39h 24m
2 stops
$1,106Air Canada
Thu, Dec 3 - Mon, Dec 7
Air Canada Logo
7:05 pm - 11:15 pm
SEA
-
TER
45h 10m
3 stops
Air Canada Logo
6:40 am - 9:57 pm
TER
-
SEA
22h 17m
3 stops
$1,109Air Canada
Tue, Nov 17 - Mon, Nov 30

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Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets
Icelandair
Oct 2
SEA7:00 pmSeattle/Tacoma Intl
34h 50m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Oct 18
LIS3:00 pmLisbon Humberto Delgado
34h 55m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$604
Icelandair
Oct 12
SEA3:40 pmSeattle/Tacoma Intl
14h 10m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Nov 12
LIS2:00 pmLisbon Humberto Delgado
35h 00m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$612
Icelandair
Oct 11
SEA7:00 pmSeattle/Tacoma Intl
34h 50m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Oct 18
LIS3:00 pmLisbon Humberto Delgado
13h 40m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$613

Delta flights from Seattle to Portugal

Our best Delta deals on Seattle to Portugal flight tickets
Delta
Dec 27
SEA2:05 pmSeattle/Tacoma Intl
23h 55m
1 stop
OPO10:00 pmPorto
Feb 2
OPO11:15 amPorto
32h 25m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$802
Delta
Dec 29
SEA2:35 pmSeattle/Tacoma Intl
23h 55m
1 stop
OPO10:30 pmPorto
Feb 2
OPO11:15 amPorto
32h 25m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$806
Delta
Dec 27
SEA5:45 amSeattle/Tacoma Intl
32h 45m
2 stops
OPO10:30 pmPorto
Jan 27
OPO5:00 amPorto
14h 50m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$811

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 12, 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

7:00 pm-1:50 pm

1 stop34h 50m

Lisbon Humberto Delgado

Sun 10/18

3:00 pm-5:55 pm

1 stop34h 55m

$604

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 9/27

3:40 pm-9:20 pm

2 stops21h 40m

Porto

Mon 10/12

9:15 pm-8:40 pm

3 stops31h 25m

$606

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/2

3:40 pm-8:20 pm

2 stops20h 40m

Lisbon Humberto Delgado

Tue 10/13

9:25 am-8:40 pm

2 stops19h 15m

$606

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 8/17

11:00 pm-8:05 am

2 stops25h 05m

Funchal Madeira

Wed 9/2

9:40 am-6:41 pm

1 stop17h 01m

$881
Quickest round-trip

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Tue 9/8

7:30 am-8:05 am

1 stop16h 35m

Funchal Madeira

Fri 9/18

9:40 am-11:36 pm

1 stop21h 56m

$954

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Tue 12/29

6:45 pm-11:10 am

1 stop32h 25m

Funchal Madeira

Mon 1/11

12:25 pm-4:55 pm

1 stop36h 30m

$976

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 12/28

2:35 pm-9:35 am

1 stop35h 00m

Funchal Madeira

Sun 1/10

10:10 am-10:35 am

2 stops32h 25m

$981

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Tue 12/29

10:31 am-11:10 am

2 stops40h 39m

Funchal Madeira

Mon 1/11

12:25 pm-11:25 am

1 stop31h 00m

$1,012

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Thu 12/3

7:45 am-11:15 pm

2 stops32h 30m

Lajes

Mon 12/7

12:35 pm-8:59 pm

2 stops39h 24m

$1,106

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Tue 11/17

7:05 pm-11:15 pm

3 stops45h 10m

Lajes

Mon 11/30

6:40 am-9:57 pm

3 stops22h 17m

$1,109

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 $838 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 $714 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 16% 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

14h 00m

Direct flights

None
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 $348Free CancellationRating
7.0
704 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom $420Free CancellationRating
7.5
693 reviews
Search Virgin Atlantic flights
LufthansaPriceFrom $482Free CancellationRating
6.8
8,131 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
8,106 reviews
Search British Airways flights
KLMPriceFrom $482Free CancellationRating
7.8
1,538 reviews
Search KLM flights
United AirlinesPriceFrom $488Free CancellationRating
7.4
9,982 reviews
Search United Airlines flights
American AirlinesPriceFrom $497Free CancellationRating
7.1
11,816 reviews
Search American Airlines flights
Air FrancePriceFrom $505Free CancellationRating
7.5
1,625 reviews
Search Air France flights
Aer LingusPriceFrom $523Free CancellationRating
7.3
1,659 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,332 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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Popular flights according to clicks in the last 7 days on momondo
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