OPO - SEA

$548 Find Cheap Flights from Porto to Seattle - Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 25% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$993
Typical prices: $928-$1,242
Turkish Airlines
Mon 1/15Wed 1/17
OPO - SEA • 1 stop
Cheapest one-way
$548
Typical prices: $649-$1,035
Multiple Airlines
Fri 12/28
OPO - SEA • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Porto and Seattle. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
September
Cheapest • 25% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Montreal Pierre Elliott Trudeau Intl (YUL)
Cheapest • Avg $907 (round-trip)
Munich Franz Josef Strauss (MUC)
Shortest trip • 14h 21m (one-way)
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Porto to Seattle (OPO-SEA)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Porto to Seattle

Fri, Jan 15 - Sun, Jan 17
Turkish Airlines Logo
10:55 am - 5:10 pmOPO  Porto-SEA Seattle/Tacoma Intl
38h 15m1 stop Istanbul
Turkish Airlines Logo
7:05 pm - 9:55 amSEA  Seattle/Tacoma Intl-OPO Porto
30h 50m1 stop Istanbul
$993Turkish Airlines
Fri, Jan 15 - Sun, Jan 17
Turkish Airlines Logo
10:55 am - 5:10 pmOPO  Porto-SEA Seattle/Tacoma Intl
38h 15m1 stop Istanbul
Turkish Airlines Logo
7:05 pm - 9:55 amSEA  Seattle/Tacoma Intl-OPO Porto
30h 50m1 stop Istanbul
$994Turkish Airlines
Fri, Jan 15 - Sun, Jan 17
Turkish Airlines Logo
10:55 am - 5:10 pmOPO  Porto-SEA Seattle/Tacoma Intl
38h 15m1 stop Istanbul
Turkish Airlines Logo
7:05 pm - 9:55 amSEA  Seattle/Tacoma Intl-OPO Porto
30h 50m1 stop Istanbul
$995Turkish Airlines
Fri, Jan 15 - Sun, Jan 17
Turkish Airlines Logo
10:55 am - 5:10 pmOPO  Porto-SEA Seattle/Tacoma Intl
38h 15m1 stop Istanbul
Turkish Airlines Logo
7:05 pm - 9:55 amSEA  Seattle/Tacoma Intl-OPO Porto
30h 50m1 stop Istanbul
$997Turkish Airlines
Mon, Nov 16 - Thu, Nov 19
Turkish Airlines Logo
4:25 pm - 11:07 pmOPO  Porto-SEA Seattle/Tacoma Intl
38h 42m2 stops Istanbul Chicago O'Hare Intl
Turkish Airlines Logo
7:05 pm - 9:55 amSEA  Seattle/Tacoma Intl-OPO Porto
30h 50m1 stop Istanbul
$1,006Turkish Airlines
Fri, Jan 15 - Sun, Jan 17
American Airlines Logo
8:20 am - 9:27 amOPO  Porto-SEA Seattle/Tacoma Intl
33h 07m2 stops Madrid Barajas Chicago O'Hare Intl
American Airlines Logo
11:55 pm - 4:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
32h 05m2 stops Chicago O'Hare Intl Madrid Barajas
$1,052American Airlines
Fri, Jan 15 - Sun, Jan 17
Air Canada Logo
6:00 am - 6:22 pmOPO  Porto-SEA Seattle/Tacoma Intl
20h 22m2 stops Frankfurt am Main Vancouver Intl
Air Canada Logo
3:15 pm - 3:25 pmSEA  Seattle/Tacoma Intl-OPO Porto
40h 10m2 stops Vancouver Intl Frankfurt am Main
$1,072Air Canada
Fri, Jan 15 - Sun, Jan 17
American Airlines Logo
8:20 am - 9:27 amOPO  Porto-SEA Seattle/Tacoma Intl
33h 07m2 stops Madrid Barajas Chicago O'Hare Intl
American Airlines Logo
11:55 pm - 4:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
32h 05m2 stops Chicago O'Hare Intl Madrid Barajas
$1,097American Airlines
Fri, Jan 15 - Sun, Jan 17
American Airlines Logo
8:20 am - 8:13 pmOPO  Porto-SEA Seattle/Tacoma Intl
19h 53m2 stops Madrid Barajas Chicago O'Hare Intl
American Airlines Logo
10:17 am - 11:45 amSEA  Seattle/Tacoma Intl-OPO Porto
17h 28m2 stops Chicago O'Hare Intl Madrid Barajas
$1,098American Airlines
Fri, Jan 15 - Sun, Jan 17
American Airlines Logo
8:20 am - 9:27 amOPO  Porto-SEA Seattle/Tacoma Intl
33h 07m2 stops Madrid Barajas Chicago O'Hare Intl
American Airlines Logo
11:55 pm - 4:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
32h 05m2 stops Chicago O'Hare Intl Madrid Barajas
$1,099American Airlines
Booking Insights

Price, demand and travel trends for Porto to Seattle flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Porto to Seattle?

Round-trip flights from Porto to Seattle typically range from $928 to $1,242. The lowest price found in the past 5 days was $993, on Turkish Airlines.

What's the cheapest day of the week to fly from Porto to Seattle?

Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from Porto to Seattle. It’s 26% cheaper than the average day, while Monday is the most expensive, with prices 15% higher.

What’s the cheapest month to fly from Porto to Seattle?

•September is the cheapest month to fly from Porto to Seattle at $815 round-trip.
•July ($4,846) and March ($1,270) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 494% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for Porto to Seattle flights

Low season

March

Cheapest flight

$548
Beat the crowds with an average 47% drop in travelers.
The most popular month to fly with an average 74% increase in travelers.
One-way flight from Porto to Seattle

When to book flights from Porto to Seattle

Are your dates flexible? Find out the best times to travel from Porto to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Porto to Seattle flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Porto to Seattle?

    Three cabin classes are available on flights from Porto to Seattle:

    • Economy Class
    • Premium Economy Class
    • Business Class

  • How long is a flight from Porto to Seattle?

    A nonstop flight from Porto to Seattle takes 00m, covering 5,083 miles.

  • Do I need a passport to fly from Porto to Seattle?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How much should I expect to pay for a Porto to Seattle flight?

    Round-trip flights from Porto to Seattle range from $928 to $1,242, with an average of $1,086 over the past 12 months. Anything below $928 counts as a good deal.

  • How are flight prices from Porto to Seattle looking right now?

    One-way fares from Porto to Seattle are currently lower than usual. Average one-way flight prices are about $673, which is 18% below the typical average for this route.

  • What car rental options are available at Seattle/Tacoma Intl Airport (SEA)?

    Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates averaging $61 for economy cars. Top options include:

    • Fox
    • Europcar
    • Thrifty
    • Budget
    • Hertz

  • Which airports can I use when flying from Porto to Seattle?

    Flights from Porto to Seattle usually depart from Porto (OPO) and arrive at Seattle/Tacoma Intl (SEA).

  • Which airports do connecting flights from Porto to Seattle pass through?

    One-stop flights from Porto to Seattle most commonly connect through:

    • Amsterdam Schiphol (AMS) - 67% of one-stop connections
    • Newark (EWR) - 14% of one-stop connections
    • Paris Charles de Gaulle (CDG) - 10% of one-stop connections
    • Munich Franz Josef Strauss (MUC) - 5% of one-stop connections

  • Can I save money by using flexible dates for flights from Porto to Seattle?

    Yes. Flexible dates can save you up to 36% on flights from Porto to Seattle. Thursday is the cheapest departure day at $805 round-trip on average, while Monday is the most expensive at $1,256, a difference of $451.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Porto to Seattle?

    Flying via Munich Franz Josef Strauss (MUC) gives the shortest average 1-stop total travel time at 14h 21m, compared with 14h 57m via Montreal Pierre Elliott Trudeau Intl (YUL) and 15h 16m via Amsterdam Schiphol (AMS).

  • What is the time difference between Porto and Seattle?

    Seattle is 8 hours behind Porto (Pacific Time vs Western European Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Seattle?

    Some of the most popular sights in Seattle are Pike Place Market, Lumen Field and Space Needle. These are among the most viewed places in Seattle on KAYAK.

Your guide to booking Porto to Seattle flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure and avoid flying on Monday. On this route, Thursday flights average $805, about $451 less than Monday fares (36% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Porto to Seattle trip for September. Fares historically average $815 round-trip in that month - typically $4,031 less than the most expensive month, which is July (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Seattle/Tacoma Intl Airport.

    • Coast Gateway Hotel
    • Seattle Airport Marriott
    • Fairfield by Marriott Inn & Suites Seattle Sea-Tac Airport

More options for your flight from Porto to Seattle

Complete your trip to Seattle with a hotel stay or car rental

Car rentals in Seattle
Hotels in Seattle
Vacations in Seattle