$355 Cheap flight deals from Seattle (SEA) to Porto (OPO)

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This Weekend's Flight Deals from Seattle to Porto

This weekend's flight prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, May 10 - Sat, May 16
SEA
Seattle - Tacoma Intl.
OPO
Dr. Francisco de Sa Carneiro
$1,194 Roundtrip, found 2 days ago
$1,194
Roundtrip
found 2 days ago
Select Turkish Airlines flight, departing Sun, May 10 from Seattle - Tacoma Intl. to Dr. Francisco de Sa Carneiro, returning Sat, May 16, priced at $1,194 found 2 days ago

Airfares from $355 One Way, $756 Round Trip from Seattle to Porto

Prices starting at $756 for return flights and $355 for one-way flights to Porto were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 8 - Thu, Sep 17
SEA
Seattle
OPO
Porto
$756 Roundtrip, found 5 days ago
$756
Roundtrip
found 5 days ago
Select Scandinavian Airlines flight, departing Tue, Sep 8 from Seattle to Porto, returning Thu, Sep 17, priced at $756 found 5 days ago
Mon, Nov 9 - Mon, Nov 23
SEA
Seattle
OPO
Porto
$774 Roundtrip, found 3 days ago
$774
Roundtrip
found 3 days ago
Select Iberia flight, departing Mon, Nov 9 from Seattle to Porto, returning Mon, Nov 23, priced at $774 found 3 days ago
Wed, Oct 21 - Wed, Oct 28
SEA
Seattle
OPO
Porto
$778 Roundtrip, found 1 day ago
$778
Roundtrip
found 1 day ago
Select British Airways flight, departing Wed, Oct 21 from Seattle to Porto, returning Wed, Oct 28, priced at $778 found 1 day ago
Tue, Oct 20 - Fri, Oct 30
SEA
Seattle
OPO
Porto
$824 Roundtrip, found 2 days ago
$824
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Tue, Oct 20 from Seattle to Porto, returning Fri, Oct 30, priced at $824 found 2 days ago
Mon, Sep 21 - Wed, Sep 30
SEA
Seattle
OPO
Porto
$836 Roundtrip, found 3 days ago
$836
Roundtrip
found 3 days ago
Select Air Canada flight, departing Mon, Sep 21 from Seattle to Porto, returning Wed, Sep 30, priced at $836 found 3 days ago

Porto economy flight packages

Price found within the past 48 hours. Click for updated prices.
Eurostars Porto Douro
4.0-star property

Eurostars Porto Douro

9.4/10 Exceptional! (1,006 reviews)

Jun 24 - Jun 30

6 night stay

Seattle (SEA) to Porto (OPO)

Delta • Non-stop roundtrip • Coach
Price was $2,366, price is now $1,640 per person
$1,640
per person
found 18 hours ago
Great location! Highly recommend The Bridge restaurant right down the street.

Reviewed on Jan 1, 2026

Torel Private Collection
5.0-star property

Torel Private Collection

No reviews

Jun 24 - Jun 30

6 night stay

Seattle (SEA) to Porto (OPO)

Delta • Non-stop roundtrip • Coach
Save 100% on your flight
Price was $2,870, price is now $1,663 per person
$1,663
per person
found 18 hours ago
LENSCAPE Coterie
5.0-star property

LENSCAPE Coterie

10/10 Exceptional! (2 reviews)

Jun 24 - Jun 30

6 night stay

Seattle (SEA) to Porto (OPO)

Delta • Non-stop roundtrip • Coach
Price was $2,904, price is now $1,815 per person
$1,815
per person
found 18 hours ago
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More About Flying To Porto from Seattle

Route Information for Flights from Seattle to Porto

Origin Airport IATA Code
SEA
Destination Airport IATA Code
OPO
Distance
Direct Flight Airlines
Earliest Flight Arrival
Latest Flight Arrival

Seattle to Porto

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Booking a trip from Seattle to Porto has never been easier. Not only will you find great deals on flights, we offer bargains on cruises, car rentals, top-notch hotels, and more. You can also research and add local activities in Porto to your flight or hotel reservation to keep the kids happy and active.

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Don’t Miss out on Miles

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Frequently asked questions

What is the shortest flight from Seattle to Porto?
It's a long way from Seattle - Tacoma Intl. Airport (SEA) to Dr. Francisco de Sa Carneiro Airport (OPO) — 11 hours and 40 minutes at least. But your time in your seat doesn't need to be a strain. Be prepared and come with the basics like your toothbrush and a pillow.
What is the cheapest day of the week to fly?
Consider flying out early in the week to save on your airfare. Orbitz data from 2021 shows that Monday is the cheapest day to depart, followed by Tuesday. Saturday showed the highest average ticket prices likely because many travelers prefer to start their vacation on a weekend.
What is the cheapest month to fly?
We won't keep you guessing, according to Orbitz data from 2021, the cheapest month to fly is February. Perfect for those who need a weekend getaway, or just a break from it all in the shortest month of the year. Be aware that the most expensive time to fly is during the height of summer in July, and in the holiday month of December.*According to flight demand on Orbitz.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

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Fare, taxes & fees: Fares include all taxes and fees, except baggage fees. Rates shown reflect fares found by other Orbitz users over the past 7 days. Due to rapidly changing airline prices & seat availability, these fares may no longer be available.

Refunds/changes/cancellations: Itinerary changes, if permitted for the fare, will have a $30 service fee charged by Orbitz. Additional airline charges may apply.

Other conditions: Schedules, fares and rules are subject to change without notice. Seats are limited and may not be available on all flights/dates or in all markets. Lower fares may be available. Fares will not be honored retroactively or in exchange for any wholly/partially unused ticket. Tickets are non-transferable and non-refundable. Fare rules are provided for the selected itinerary before booking.