$351 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.

Fri, Aug 28 - Mon, Sep 7
SEA
Seattle - Tacoma Intl.
OPO
Dr. Francisco de Sa Carneiro
$1,338 Roundtrip, found 1 day ago
$1,338
Roundtrip
found 1 day ago
Select British Airways flight, departing Fri, Aug 28 from Seattle - Tacoma Intl. to Dr. Francisco de Sa Carneiro, returning Mon, Sep 7, priced at $1,338 found 1 day ago

Airfares from $351 One Way, $747 Round Trip from Seattle to Porto

Prices starting at $747 for return flights and $351 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.

Wed, Nov 25 - Fri, Dec 4
SEA
Seattle
OPO
Porto
$747 Roundtrip, found 5 hours ago
$747
Roundtrip
found 5 hours ago
Select Lufthansa flight, departing Wed, Nov 25 from Seattle to Porto, returning Fri, Dec 4, priced at $747 found 5 hours ago
Mon, Mar 15 - Wed, Mar 31
SEA
Seattle
OPO
Porto
$760 Roundtrip, found 6 hours ago
$760
Roundtrip
found 6 hours ago
Select Air Canada flight, departing Mon, Mar 15 from Seattle to Porto, returning Wed, Mar 31, priced at $760 found 6 hours ago
Mon, Jan 11 - Mon, Jan 25
SEA
Seattle
OPO
Porto
$767 Roundtrip, found 3 days ago
$767
Roundtrip
found 3 days ago
Select Swiss International Air Lines flight, departing Mon, Jan 11 from Seattle to Porto, returning Mon, Jan 25, priced at $767 found 3 days ago
Mon, Nov 16 - Wed, Dec 2
SEA
Seattle
OPO
Porto
$775 Roundtrip, found 6 days ago
$775
Roundtrip
found 6 days ago
Select Iberia flight, departing Mon, Nov 16 from Seattle to Porto, returning Wed, Dec 2, priced at $775 found 6 days ago
Wed, Apr 28 - Wed, May 5
SEA
Seattle
OPO
Porto
$796 Roundtrip, found 1 day ago
$796
Roundtrip
found 1 day ago
Select British Airways flight, departing Wed, Apr 28 from Seattle to Porto, returning Wed, May 5, priced at $796 found 1 day ago

Porto economy flight packages

Price found within the past 48 hours. Click for updated prices.
Legendary Porto Hotel
3.0-star property

Legendary Porto Hotel

8.6/10 Excellent! (1,007 reviews)

Oct 1 - Oct 4

3 night stay

Seattle (SEA) to Porto (OPO)

Lufthansa • Non-stop roundtrip • Coach
Price was $1,309, price is now $1,222 per person
$1,222
per person
found 9 hours ago

Village Aparthotel by BOA
4.0-star property

Village Aparthotel by BOA

9.8/10 Exceptional! (116 reviews)

Oct 1 - Oct 4

3 night stay

Seattle (SEA) to Porto (OPO)

Lufthansa • Non-stop roundtrip • Coach
Price was $1,400, price is now $1,293 per person
$1,293
per person
found 9 hours ago

Porto River
4.0-star property

Porto River

9.6/10 Exceptional! (550 reviews)

Oct 1 - Oct 4

3 night stay

Seattle (SEA) to Porto (OPO)

Lufthansa • Non-stop roundtrip • Coach
Price was $1,630, price is now $1,540 per person
$1,540
per person
found 9 hours ago
Every time I come to Porto I stay at this hotel. It’s my favorite. Great staff. Fabulous rooms. Top restaurant on the premises. The breakfast was great with many choice. I will return and stay here every time. Walking distance to everything. This is a must. You’ll love it.

Reviewed on Aug 23, 2026

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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

Orbitz can provide you with the greatest deals on a wide range of Seattle to Porto flights. Orbitz offers guaranteed low prices and offers you the convenience of cutting-edge mobile tools thus providing you with your best travel experience ever.

Mobile Apps for Seattle to Porto Flights

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 Budget Flying Made Simple

Finding cheap flights from Seattle to Porto is easy with Orbitz. You can pick and choose airlines for your international flights to create inexpensive yet convenient travel arrangements.

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.