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Cheap flights from Portugal to Seattle from $355

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portugal to Seattle departing on 9/12. 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 Portugal to Seattle

Recent round-trip flight deals from Portugal to Seattle

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:05 pm - 8:40 pm
LIS
-
SEA
33h 35m
3 stops
Multiple Airlines Logo
7:00 pm - 10:50 pm
SEA
-
LIS
19h 50m
2 stops
$774Multiple Airlines
Wed, Sep 9 - Tue, Sep 22
WestJet Logo
6:10 am - 9:40 am
LIS
-
SEA
35h 30m
3 stops
WestJet Logo
7:35 pm - 9:45 pm
SEA
-
LIS
18h 10m
2 stops
$780WestJet
Sun, Jun 21 - Tue, Jul 7
Multiple Airlines Logo
6:10 am - 9:40 am
LIS
-
SEA
35h 30m
3 stops
Multiple Airlines Logo
8:00 am - 9:45 pm
SEA
-
LIS
29h 45m
3 stops
$808Multiple Airlines
Sun, Jun 21 - Tue, Jul 7
WestJet Logo
6:10 am - 9:40 am
LIS
-
SEA
35h 30m
3 stops
WestJet Logo
7:00 am - 8:55 pm
SEA
-
LIS
29h 55m
2 stops
$855WestJet
Sat, Aug 15 - Sat, Aug 29
Multiple Airlines Logo
6:10 am - 9:40 am
LIS
-
SEA
35h 30m
2 stops
Multiple Airlines Logo
7:00 pm - 12:00 pm
SEA
-
LIS
33h 00m
3 stops
$856Multiple Airlines
Thu, Jul 23 - Thu, Jul 30
Delta Logo
5:00 am - 4:24 pm
LIS
-
SEA
19h 24m
1 stop
Delta Logo
1:30 pm - 5:50 pm
SEA
-
LIS
20h 20m
1 stop
$879Delta
Sun, Jun 21 - Tue, Jul 7
American Airlines Logo
12:25 pm - 11:58 pm
OPO
-
SEA
19h 33m
2 stops
American Airlines Logo
1:38 pm - 11:45 am
SEA
-
OPO
38h 07m
2 stops
$886American Airlines
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
8:20 am - 12:11 am
OPO
-
SEA
23h 51m
2 stops
American Airlines Logo
6:15 am - 4:00 pm
SEA
-
OPO
25h 45m
2 stops
$887American Airlines
Thu, Sep 17 - Mon, Sep 21
Scandinavian Airlines Logo
5:55 pm - 1:45 pm
OPO
-
SEA
27h 50m
1 stop
Scandinavian Airlines Logo
3:55 pm - 5:05 pm
SEA
-
OPO
17h 10m
1 stop
$934Scandinavian Airlines
Fri, Sep 11 - Sat, Sep 26
Delta Logo
5:00 am - 11:47 am
OPO
-
SEA
14h 47m
1 stop
Delta Logo
11:20 am - 3:25 pm
SEA
-
OPO
20h 05m
2 stops
$949Delta
Fri, Sep 11 - Sat, Sep 26

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American Airlines flights from Portugal to Seattle

Our best American Airlines deals on Portugal to Seattle flight tickets
American Airlines
Sep 17
OPO12:25 pmPorto
19h 33m
2 stops
SEA11:58 pmSeattle/Tacoma Intl
Sep 21
SEA1:38 pmSeattle/Tacoma Intl
38h 07m
2 stops
OPO11:45 amPorto
$886
American Airlines
Sep 17
OPO8:20 amPorto
23h 51m
2 stops
SEA12:11 amSeattle/Tacoma Intl
Sep 21
SEA6:15 amSeattle/Tacoma Intl
25h 45m
2 stops
OPO4:00 pmPorto
$887
American Airlines
Sep 17
OPO12:25 pmPorto
19h 33m
2 stops
SEA11:58 pmSeattle/Tacoma Intl
Sep 21
SEA6:15 amSeattle/Tacoma Intl
25h 45m
2 stops
OPO4:00 pmPorto
$888

Scandinavian Airlines flights from Portugal to Seattle

Our best Scandinavian Airlines deals on Portugal to Seattle flight tickets
Scandinavian Airlines
Aug 29
LIS10:55 pmLisbon Humberto Delgado
22h 50m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
Sep 11
SEA3:55 pmSeattle/Tacoma Intl
22h 10m
1 stop
LIS10:05 pmLisbon Humberto Delgado
$901
Scandinavian Airlines
Sep 11
OPO5:55 pmPorto
27h 50m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
Sep 26
SEA3:55 pmSeattle/Tacoma Intl
17h 10m
1 stop
OPO5:05 pmPorto
$934

momondo Fare Finder

 
Customize your flight search to find flights from Portugal to Seattle 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 11, 2026.
Use the filters below to find and compare flights from Portugal to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Wed 9/9

7:05 pm-8:40 pm

3 stops33h 35m

Seattle/Tacoma Intl

Tue 9/22

7:00 pm-10:50 pm

2 stops19h 50m

$774

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Sun 6/21

6:10 am-9:40 am

3 stops35h 30m

Seattle/Tacoma Intl

Tue 7/7

7:35 pm-9:45 pm

2 stops18h 10m

$780

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Sun 6/21

6:10 am-9:40 am

3 stops35h 30m

Seattle/Tacoma Intl

Tue 7/7

8:00 am-9:45 pm

3 stops29h 45m

$808

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Sat 8/15

6:10 am-9:40 am

3 stops35h 30m

Seattle/Tacoma Intl

Sat 8/29

7:00 am-8:55 pm

2 stops29h 55m

$855

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 7/23

6:10 am-9:40 am

2 stops35h 30m

Seattle/Tacoma Intl

Thu 7/30

7:00 pm-12:00 pm

3 stops33h 00m

$856

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Sun 6/21

5:00 am-4:24 pm

1 stop19h 24m

Seattle/Tacoma Intl

Tue 7/7

1:30 pm-5:50 pm

1 stop20h 20m

$879

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 9/17

12:25 pm-11:58 pm

2 stops19h 33m

Seattle/Tacoma Intl

Mon 9/21

1:38 pm-11:45 am

2 stops38h 07m

$886

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 9/17

8:20 am-12:11 am

2 stops23h 51m

Seattle/Tacoma Intl

Mon 9/21

6:15 am-4:00 pm

2 stops25h 45m

$887

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 9/11

5:55 pm-1:45 pm

1 stop27h 50m

Seattle/Tacoma Intl

Sat 9/26

3:55 pm-5:05 pm

1 stop17h 10m

$934
Quickest round-trip

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 9/11

5:00 am-11:47 am

1 stop14h 47m

Seattle/Tacoma Intl

Sat 9/26

11:20 am-3:25 pm

2 stops20h 05m

$949

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 Seattle from

How to get the cheapest flight ticket from Portugal to Seattle

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 Seattle?

In general, September is the cheapest month to fly from Portugal to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $553. If you don’t want to visit Seattle in September, then you should wait until August to fly from Portugal, when ticket prices are also cheap, with an average price of $753.

Can stopping save me money on Portugal to Seattle flights?

You could potentially save up to 5% on your flight if you consider stops on a Portugal to Seattle flight.

Cheap Portugal to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portugal to Seattle

Fastest flight time

14h 37m

Direct flights

None
The fastest flight from Portugal to Seattle takes 14h 37m
There are no direct flights from Portugal to Seattle. There are no popular flight routes from Portugal to Seattle.
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Frequently asked questions about flying from Portugal to Seattle

  • When did momondo last update prices for flights from Portugal to Seattle/Tacoma Intl Airport?

    Prices for flights from Portugal to Seattle/Tacoma Intl Airport are updated daily.

  • How many operators does momondo search for flights from Portugal to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Portugal to Seattle/Tacoma Intl Airport?

    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 Portugal to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport 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 Portugal to Seattle

Compare and see reviews for airlines that fly from Portugal to Seattle with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $1,040Free CancellationRating
7.9
8,396 reviews
Search Delta flights

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Redmond
Kent
Lakewood
Puyallup
Tukwila
Marysville
Cle Elum
Federal Way
Fife
Centralia
Shoreline
Westport
Kirkland

Why use momondo?

Why should I use momondo to find a flight deal from Portugal to Seattle?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Portugal to Seattle for you.

Can I find flights from Portugal to Seattle with flexible booking policies on momondo?

Yes. All flights to Seattle from Portugal on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Portugal to Seattle?

Once all potential Portugal to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Portugal to Seattle right now. Can momondo alert me if prices change?

Price alerts on flights to Seattle from Portugal are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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