$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, Aug 16 - Fri, Aug 21
SEA
Seattle - Tacoma Intl.
OPO
Dr. Francisco de Sa Carneiro
$1,461 Roundtrip, found 6 days ago
$1,461
Roundtrip
found 6 days ago
Select British Airways flight, departing Sun, Aug 16 from Seattle - Tacoma Intl. to Dr. Francisco de Sa Carneiro, returning Fri, Aug 21, priced at $1,461 found 6 days ago

Airfares from $355 One Way, $760 Round Trip from Seattle to Porto

Prices starting at $760 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, Nov 3 - Fri, Nov 13
SEA
Seattle
OPO
Porto
$760 Roundtrip, found 6 days ago
$760
Roundtrip
found 6 days ago
Select British Airways flight, departing Tue, Nov 3 from Seattle to Porto, returning Fri, Nov 13, priced at $760 found 6 days ago
Mon, Nov 9 - Tue, Nov 17
SEA
Seattle
OPO
Porto
$773 Roundtrip, found 5 days ago
$773
Roundtrip
found 5 days ago
Select Iberia flight, departing Mon, Nov 9 from Seattle to Porto, returning Tue, Nov 17, priced at $773 found 5 days ago
Wed, Apr 21 - Thu, May 6
SEA
Seattle
OPO
Porto
$804 Roundtrip, found 1 day ago
$804
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Wed, Apr 21 from Seattle to Porto, returning Thu, May 6, priced at $804 found 1 day ago
Sun, Mar 7 - Tue, Mar 16
SEA
Seattle
OPO
Porto
$814 Roundtrip, found 1 day ago
$814
Roundtrip
found 1 day ago
Select Air Canada flight, departing Sun, Mar 7 from Seattle to Porto, returning Tue, Mar 16, priced at $814 found 1 day ago
Wed, Apr 14 - Fri, Apr 23
SEA
Seattle
OPO
Porto
$822 Roundtrip, found 6 days ago
$822
Roundtrip
found 6 days ago
Select Swiss International Air Lines flight, departing Wed, Apr 14 from Seattle to Porto, returning Fri, Apr 23, priced at $822 found 6 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! (1,000 reviews)

Oct 3 - Oct 5

2 night stay

Seattle (SEA) to Porto (OPO)

Delta • Non-stop roundtrip • Coach
Price was $1,397, price is now $1,223 per person
$1,223
per person
found 1 day ago
The location and the cleaning were very good, but the balcony was dirt. Nevertheless the view from the balcony was outstanding.

Reviewed on Aug 6, 2026

Torel Private Collection
5.0-star property

Torel Private Collection

9.8/10 Exceptional! (32 reviews)

Oct 3 - Oct 5

2 night stay

Seattle (SEA) to Porto (OPO)

Delta • Non-stop roundtrip • Coach
Price was $1,773, price is now $1,415 per person
$1,415
per person
found 1 day ago
I felt like the staff to guest ratio was 2/1 and everyone was most helpful and congenial we were in the penthouse riverside room with a private terrace and it was beautifully decorated and appointed. Such luxury. The 4 course breakfast was worth rolling out of the comfy bed for. We loved our stay and will recommend it to all of our friends. We watched the sunset on the wisteria canopied terrace each night of our stay and entertained our friends there. Thanks all

Reviewed on Aug 4, 2026

Eurostars Aliados
5.0-star property

Eurostars Aliados

9.4/10 Exceptional! (750 reviews)

Oct 3 - Oct 5

2 night stay

Seattle (SEA) to Porto (OPO)

Delta • Non-stop roundtrip • Coach
Price was $1,479, price is now $1,271 per person
$1,271
per person
found 1 day 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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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.