Cheap flights from Seattle to Portugal from $283
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 10/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Fly from
Fly to
Route
Depart
Return
SeattlePorto
SEA Seattle/Tacoma Intl - OPO Porto
SEAOPO
Seattle/Tacoma Intl
Thu 11/5
4:05 pm-10:00 pm
1 stop21h 55m
Porto
Thu 11/12
10:15 am-11:00 pm
1 stop20h 45m
SeattlePorto
SEA Seattle/Tacoma Intl - OPO Porto
SEAOPO
Seattle/Tacoma Intl
Thu 11/5
4:05 pm-10:00 pm
1 stop21h 55m
Porto
Thu 11/12
5:00 am-4:53 pm
2 stops19h 53m
SeattleLisbon
SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado
SEALIS
Seattle/Tacoma Intl
Thu 4/8
1:30 pm-11:15 am
1 stop13h 45m
Lisbon Humberto Delgado
Fri 4/16
5:35 am-11:15 am
1 stop13h 40m
SeattleLisbon
SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado
SEALIS
Seattle/Tacoma Intl
Thu 4/8
1:30 pm-5:50 pm
1 stop20h 20m
Lisbon Humberto Delgado
Fri 4/16
11:55 am-10:05 pm
2 stops18h 10m
SeattlePorto
SEA Seattle/Tacoma Intl - OPO Porto
SEAOPO
Seattle/Tacoma Intl
Tue 1/5
4:05 pm-10:00 pm
1 stop21h 55m
Porto
Thu 2/4
11:15 am-11:47 am
1 stop32h 32m
SeattlePorto
SEA Seattle/Tacoma Intl - OPO Porto
SEAOPO
Seattle/Tacoma Intl
Tue 1/5
4:05 pm-10:00 pm
1 stop21h 55m
Porto
Mon 2/8
11:15 am-11:47 am
1 stop32h 32m
SeattlePorto
SEA Seattle/Tacoma Intl - OPO Porto
SEAOPO
Seattle/Tacoma Intl
Tue 2/2
4:05 pm-10:00 pm
1 stop21h 55m
Porto
Wed 3/3
5:00 am-11:35 am
1 stop14h 35m
SeattlePorto
SEA Seattle/Tacoma Intl - OPO Porto
SEAOPO
Seattle/Tacoma Intl
Sun 1/31
7:45 am-11:15 am
2 stops43h 30m
Porto
Thu 3/4
6:00 am-6:20 pm
2 stops20h 20m
SeattlePorto
SEA Seattle/Tacoma Intl - OPO Porto
SEAOPO
Seattle/Tacoma Intl
Mon 2/1
7:45 am-11:15 am
2 stops43h 30m
Porto
Wed 3/3
6:00 am-9:30 am
2 stops35h 30m
SeattleLisbon
SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado
SEALIS
Seattle/Tacoma Intl
Thu 1/21
6:00 am-8:00 am
2 stops18h 00m
Lisbon Humberto Delgado
Sun 1/31
10:00 am-10:02 pm
1 stop20h 02m
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 $498, 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 $580.
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 week ahead of your departure date. In general, you can expect to find flights to Portugal for around $867 when searching week 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 $722 on momondo.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Portugal?
Lufthansa, United Airlines, and British Airways are the most popular carriers operating from Seattle/Tacoma Intl to Portugal
What airlines fly to Portugal?
Delta, British Airways and United Airlines are the top three most popular airlines that fly to Portugal from Seattle according to our data. Delta is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 12 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.
Cheap Seattle to Portugal flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Portugal
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?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Portugal is 12 as of October 2026.
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 | ||
|---|---|---|---|---|---|
| PriceFrom $360 | Free Cancellation | Rating 6.9 758 reviews | |||
| PriceFrom $462 | Free Cancellation | Rating 6.8 8,271 reviews | |||
| PriceFrom $481 | Free Cancellation | Rating 7.8 1,580 reviews | |||
| PriceFrom $482 | Free Cancellation | Rating 6.7 8,255 reviews | |||
| PriceFrom $482 | Free Cancellation | Rating 7.4 10,319 reviews | |||
| PriceFrom $497 | Free Cancellation | Rating 7.0 12,146 reviews | |||
| PriceFrom $504 | Free Cancellation | Rating 7.5 1,650 reviews | |||
| PriceFrom $550 | Free Cancellation | Rating 7.8 8,645 reviews | |||
| PriceFrom $567 | Free Cancellation | Rating 7.4 2,010 reviews | |||
| PriceFrom $660 | Free Cancellation | Rating 7.1 11,745 reviews |
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.