Question 1

What is the cheapest flight from Porto to Seattle?

Accepted Answer

In the last 3 days, the lowest price for a flight from Porto to Seattle was $468 for a one-way ticket and $839 for a round-trip. <a href='/flight-routes/Porto-OPO/Seattle-Tacoma-Intl-SEA'>Visit our flight page for the latest deals!>/a>

Question 2

Do I need a passport to fly between Porto and Seattle?

Accepted Answer

A passport is required to fly from Porto to Seattle. <a href='/flight-routes/Porto-OPO/Seattle-Tacoma-Intl-SEA'>Visit our flight page for the latest deals!>/a>

Question 3

Which aircraft models fly most regularly from Porto to Seattle?

Accepted Answer

We unfortunately don’t have that data for this specific route.

Question 4

How does KAYAK find such low prices on flights from Porto to Seattle?

Accepted Answer

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Porto to Seattle. <a href='/flight-routes/Porto-OPO/Seattle-Tacoma-Intl-SEA'>Visit our flight page for the latest deals!>/a>

Question 5

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to Seattle?

Accepted Answer

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Porto is likely to change within 7 days, so travelers know whether to wait or book now. <a href='/flight-routes/Porto-OPO/Seattle-Tacoma-Intl-SEA'>Visit our flight page for the latest deals!>/a>

Question 6

What is the Hacker Fare option on flights from Porto to Seattle?

Accepted Answer

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Porto with another airline. Booking your flights between Porto and SEA can sometimes prove cheaper using this method. <a href='/flight-routes/Porto-OPO/Seattle-Tacoma-Intl-SEA'>Visit our flight page for the latest deals!>/a>

Question 7

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to Seattle?

Accepted Answer

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. <a href='/flight-routes/Porto-OPO/Seattle-Tacoma-Intl-SEA'>Visit our flight page for the latest deals!>/a>

Question 8

What is the cheapest layover airport when flying from Porto to Seattle?

Accepted Answer

Flights via Amsterdam (AMS) offer the most affordable fares, with an average round-trip price of $2,681.

Question 9

What is the most popular layover airport when flying from Porto to Seattle?

Accepted Answer

Frankfurt am Main (FRA) is the top choice – 50% of KAYAK users who clicked on 1-stop flights from Porto to Seattle picked an itinerary connecting there.

Question 10

Which layover airport has the quickest connection when flying from Porto to Seattle?

Accepted Answer

If you prefer a quick connection, Amsterdam (AMS) often has the shortest layovers from Porto to Seattle, with an average of 2h 41m.

Question 11

Which layover airport offers the shortest total travel time from Porto to Seattle?

Accepted Answer

Consider flying via Frankfurt am Main (FRA) for the shortest journey. The average one-way travel time for flights connecting there is 14h 03m.

Question 12

Which airlines provide the cheapest flights from Porto to Seattle?

Accepted Answer

In the past 3 days, the cheapest round-trip tickets from Porto to Seattle were found on United Airlines ($897) and Delta ($902).

Question 13

Which airlines provide the cheapest flights from Porto to Seattle?

Accepted Answer

In the past 3 days, the cheapest round-trip tickets from Porto to Seattle were found on United Airlines ($897) and Delta ($902).

Low season	April
High season	August
Cheapest flight	$468

OPO - SEA

$468 Find Cheap Flights from Porto to Seattle

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

Everything you should know

Cheap Flights from Porto to Seattle (OPO-SEA)

Recent round-trip flight deals from Porto to Seattle

Recent one-way flight deals from Porto to Seattle

KAYAK's insights & trends for Porto to Seattle flights

Get data-powered insights and trends into flights from Porto to Seattle to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Porto to Seattle?

In the past 3 days, the cheapest round-trip tickets from Porto to Seattle were found on United Airlines ($897) and Delta ($902).

What is the most popular layover airport when flying from Porto to Seattle?

Frankfurt am Main (FRA) is the top choice – 50% of KAYAK users who clicked on 1-stop flights from Porto to Seattle picked an itinerary connecting there.

What is the cheapest layover airport when flying from Porto to Seattle?

Flights via Amsterdam (AMS) offer the most affordable fares, with an average round-trip price of $2,681.

Which layover airport offers the shortest total travel time from Porto to Seattle?

Consider flying via Frankfurt am Main (FRA) for the shortest journey. The average one-way travel time for flights connecting there is 14h 03m.

Which layover airport has the quickest connection when flying from Porto to Seattle?

If you prefer a quick connection, Amsterdam (AMS) often has the shortest layovers from Porto to Seattle, with an average of 2h 41m.

Good to know

When to book flights from Porto to Seattle

FAQs for booking flights from Porto to Seattle

What is the cheapest flight from Porto to Seattle?

In the last 3 days, the lowest price for a flight from Porto to Seattle was $468 for a one-way ticket and $839 for a round-trip.

Do I need a passport to fly between Porto and Seattle?

A passport is required to fly from Porto to Seattle.

Which aircraft models fly most regularly from Porto to Seattle?

We unfortunately don’t have that data for this specific route.

How does KAYAK find such low prices on flights from Porto to Seattle?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Porto to Seattle.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to Seattle?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Porto is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Porto to Seattle?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Porto with another airline. Booking your flights between Porto and SEA can sometimes prove cheaper using this method.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to Seattle?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight from Porto to Seattle

Information on your arrival and departure airports

Cabin class types available on flights from Porto to Seattle

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

Find direct flights to and from Porto and Seattle

Flights to other popular destinations

Flights from domestic origins to Seattle

Choose which airport to fly into in Seattle

Find deals for your return flight