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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 9/19. 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.
Virgin Atlantic Logo
7:38 am - 10:45 am
SEA
-
LIS
19h 07m
1 stop
Virgin Atlantic Logo
9:55 am - 11:20 pm
LIS
-
SEA
21h 25m
1 stop
$528Virgin Atlantic
Sun, Sep 6 - Sun, Sep 13
Virgin Atlantic Logo
9:53 am - 10:45 am
SEA
-
LIS
16h 52m
2 stops
Virgin Atlantic Logo
9:55 am - 11:20 pm
LIS
-
SEA
21h 25m
1 stop
$530Virgin Atlantic
Sun, Sep 6 - Sun, Sep 13
Scandinavian Airlines Logo
3:55 pm - 10:05 pm
SEA
-
LIS
22h 10m
1 stop
Scandinavian Airlines Logo
10:55 pm - 1:45 pm
LIS
-
SEA
22h 50m
1 stop
$611Scandinavian Airlines
Fri, Sep 4 - Sat, Sep 12
Scandinavian Airlines Logo
3:55 pm - 10:05 pm
SEA
-
LIS
22h 10m
1 stop
Scandinavian Airlines Logo
10:55 pm - 1:45 pm
LIS
-
SEA
22h 50m
1 stop
$620Scandinavian Airlines
Fri, Sep 11 - Sat, Sep 19
British Airways Logo
8:20 pm - 8:35 pm
SEA
-
OPO
16h 15m
1 stop
British Airways Logo
8:40 pm - 10:51 pm
OPO
-
SEA
33h 11m
2 stops
$787British Airways
Sun, Oct 18 - Mon, Oct 26
United Airlines Logo
5:00 am - 8:40 am
SEA
-
PDL
20h 40m
2 stops
United Airlines Logo
11:00 am - 9:15 pm
PDL
-
SEA
41h 15m
3 stops
$827United Airlines
Sun, Aug 16 - Tue, Sep 1
United Airlines Logo
5:13 pm - 8:05 am
SEA
-
FNC
30h 52m
2 stops
United Airlines Logo
9:40 am - 11:04 pm
FNC
-
SEA
21h 24m
2 stops
$882United Airlines
Mon, Aug 17 - Wed, Sep 2
British Airways Logo
2:46 pm - 2:15 pm
SEA
-
FNC
63h 29m
2 stops
British Airways Logo
12:50 pm - 4:55 pm
FNC
-
SEA
36h 05m
1 stop
$1,008British Airways
Sat, Nov 21 - Sun, Nov 29
Air Canada Logo
7:45 am - 11:00 am
SEA
-
TER
44h 15m
2 stops
Air Canada Logo
12:35 pm - 8:59 pm
TER
-
SEA
39h 24m
2 stops
$1,026Air Canada
Sun, Nov 15 - Mon, Nov 23
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
$1,105Air Canada
Thu, Dec 3 - Mon, Dec 7

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Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Nov 8
SEA3:15 pmSeattle/Tacoma Intl
35h 25m
2 stops
LIS10:40 amLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
24h 57m
2 stops
SEA9:57 pmSeattle/Tacoma Intl
$742
Air Canada
Nov 4
SEA8:40 amSeattle/Tacoma Intl
16h 15m
2 stops
LIS8:55 amLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
24h 57m
2 stops
SEA9:57 pmSeattle/Tacoma Intl
$747
Air Canada
Nov 9
SEA7:45 amSeattle/Tacoma Intl
21h 05m
2 stops
OPO12:50 pmPorto
Nov 26
OPO6:00 amPorto
35h 27m
2 stops
SEA9:27 amSeattle/Tacoma Intl
$811

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
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$727
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
$729
Lufthansa
Nov 8
SEA3:15 pmSeattle/Tacoma Intl
35h 25m
2 stops
LIS10:40 amLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$735

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 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

Sun 9/6

7:38 am-10:45 am

1 stop19h 07m

Lisbon Humberto Delgado

Sun 9/13

9:55 am-11:20 pm

1 stop21h 25m

$528
Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 9/6

9:53 am-10:45 am

2 stops16h 52m

Lisbon Humberto Delgado

Sun 9/13

9:55 am-11:20 pm

1 stop21h 25m

$530

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 9/4

3:55 pm-10:05 pm

1 stop22h 10m

Lisbon Humberto Delgado

Sat 9/12

10:55 pm-1:45 pm

1 stop22h 50m

$611

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 9/11

3:55 pm-10:05 pm

1 stop22h 10m

Lisbon Humberto Delgado

Sat 9/19

10:55 pm-1:45 pm

1 stop22h 50m

$620

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/18

8:20 pm-8:35 pm

1 stop16h 15m

Porto

Mon 10/26

8:40 pm-10:51 pm

2 stops33h 11m

$787

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Sun 8/16

5:00 am-8:40 am

2 stops20h 40m

Ponta Delgada Nordela

Tue 9/1

11:00 am-9:15 pm

3 stops41h 15m

$827

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 8/17

5:13 pm-8:05 am

2 stops30h 52m

Funchal Madeira

Wed 9/2

9:40 am-11:04 pm

2 stops21h 24m

$882

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Sat 11/21

2:46 pm-2:15 pm

2 stops63h 29m

Funchal Madeira

Sun 11/29

12:50 pm-4:55 pm

1 stop36h 05m

$1,008

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Sun 11/15

7:45 am-11:00 am

2 stops44h 15m

Lajes

Mon 11/23

12:35 pm-8:59 pm

2 stops39h 24m

$1,026

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

$1,105

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 $834 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 $717 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 34% 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 30m

Direct flights

None
The fastest flight from Seattle to Portugal takes 14h 30m
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
692 reviews
Search Icelandair flights
LufthansaPriceFrom $475Free CancellationRating
6.8
8,108 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
8,080 reviews
Search British Airways flights
KLMPriceFrom $482Free CancellationRating
7.8
1,531 reviews
Search KLM flights
United AirlinesPriceFrom $488Free CancellationRating
7.4
9,896 reviews
Search United Airlines flights
American AirlinesPriceFrom $497Free CancellationRating
7.1
11,772 reviews
Search American Airlines flights
Air FrancePriceFrom $504Free CancellationRating
7.5
1,614 reviews
Search Air France flights
Aer LingusPriceFrom $535Free CancellationRating
7.3
1,631 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,270 reviews
Search Air Canada flights
DeltaPriceFrom $550Free CancellationRating
7.8
8,450 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

Popular cities in Portugal

Popular flights according to clicks in the last 7 days on momondo
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