Cheap flights from Seattle to Porto

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Flight deals from Seattle to Porto Airport

Looking for a cheap last-minute deal or the best return flight from Seattle to Porto Airport? If you want to travel next month, return fares start from $902. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Seattle to Porto

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Seattle to Porto flights are currently cheapest in November.

Seattle to Porto: Alternative routes

Compare routes from Seattle to Porto below. You may find an airport to fly into that's cheaper, faster, or easier than Porto.

Seattle to Porto: Flight information

The things to know before you go.
Cheapest flight found$390
Cheapest month to flyNovember

Finding cheap flights from Seattle to Porto: Frequently asked questions

The best price we found for a return flight from Seattle to Porto is $889. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Seattle to Porto. But we found flights with one stop from $889.
As of March 2026, there are no flights flying from Seattle to Porto.
The cheapest month to fly from Seattle to Porto is usually September.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Porto Airport on Wednesday, 16 September 2026.
No airlines currently offer direct flights between Seattle and Porto Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Porto but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Porto is around 40 days in advance, so don’t leave your flight to the last minute.
The cheapest airline that flies to Porto is Turkish Airlines .

Flying from Seattle to Porto Airport (OPO): What you need to know

  • Porto Airport is located in Porto. The city operates on the UTC+0 timezone and is eight hours ahead of Seattle.

  • Give yourself plenty of time to make your flight from Seattle to OPO. A good rule of thumb is to arrive at least two hours before international departures and an hour ahead for domestic flights.

  • With more people on the move during peak months like July, be at your terminal even earlier. Two hours for domestic flights and up to four for international journeys will allow extra time for delays. Remember things also get busy during major holidays like July Fourth.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • A stopover is the ideal opportunity to take a break from travelling and maybe even visit a new city. When searching for cheap flights from Seattle to OPO leaving from Seattle-Tacoma International Airport (SEA), deselect the 'Direct flights only' box to discover where you can stop along the way. Here's where you could connect through:

    • Amsterdam Schiphol Airport (AMS)

    • Paris Charles de Gaulle Airport (CDG)

    • Newark Liberty International Airport (EWR)

  • Located around 23 kilometres from the centre of Seattle, SEA can be reached in about 25 minutes by car (depending on traffic). The journey on public transport is roughly 35 minutes.

  • Searching for a convenient hotel near Seattle-Tacoma International Airport? If you've booked an early flight from Seattle to Porto Airport, these accommodation options will have you sleeping conveniently close to check-in:

  • Seattle-Tacoma International Airport has an excellent on-time record, so you're unlikely to face delays. Departures from SEA arrive at their destination as scheduled 80% of the time.

Seattle Paine Field International Airport (PAE)

  • PAE is around 40 kilometres from central Seattle. It'll take you 40 minutes or so to get to the airport in a car from the city centre. Public transport takes approximately 1 hour 30 minutes.

  • Want to treat yourself to an extra night away before your Seattle to OPO flight? Kick back in a hotel near Seattle Paine Field International Airport before your adventure officially starts. These stays are expecting you:

  • Most flights that leave Seattle Paine Field International Airport reach their destination as planned. It maintains a high on-time performance rate of 80%.

About Porto Airport (OPO)

Getting from Porto Airport (OPO) to central Porto

  • Porto Airport is around 11 kilometres from the centre of Porto. It takes around 20 minutes or so to drive to the city.

  • Travelling on public transport takes roughly 30 minutes.

How to find the cheapest flights from Seattle to Porto Airport (OPO)

  • $390 is currently the best price for a one-way ticket from Seattle to Porto Airport. A return flight starts at $889. These fares may change depending on availability.

  • To find cheap flights from Seattle to OPO, book in advance. Airlines generally offer lower prices when flights first go on sale.

  • If you're flexible with your travel dates, use the 'Whole month' tool. It'll give you the lowest price across the month when searching for your Seattle to Porto Airport ticket.

  • Finding a cheap plane ticket from Seattle to OPO is a breeze with Price Alerts. All you need to do is create one of these automatic alerts and we'll get in touch when the price has dropped.

  • Find an affordable flight from Seattle to Porto Airport by using the search filters. Choose your preferred duration, number of stops and airlines, then sort the results by 'Cheapest' for the best deals.

The best time to fly from Seattle to Porto Airport (OPO)

  • It's time to work out when to book your flight from Seattle to Porto Airport (OPO). August is when most people travel to Porto. If you like your getaways a little more chill, head there in December.

  • Lock in a Seattle to OPO plane ticket departing in August if you're eager to explore the city during its warmest month. Expect temperatures in Porto to range from 14ºC (57ºF) to 32ºC (90ºF).

  • Search for cheap tickets from Seattle to Porto Airport in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between 3ºC (37ºF) and 14ºC (57ºF).

More about Porto

  • When it comes to looking for somewhere to lay your head, you'll find the most popular stays in Porto right here. Check out these hotels once you've locked in your flight from Seattle to Porto Airport:

  • Every great holiday has to include some sightseeing. Ribeira District, Rio Douro and Livraria Lello are must-do's during your Porto adventure.

Explore more of Portugal

  • Porto has plenty going for it, but there are so many other corners of Portugal just waiting to be explored. About 290 kilometres south of Porto, a trip to Lisbon will keep you busy. Start with attractions like Pasteis de Belém, belém and Real Mosteiro de Santa Maria de Belém.

  • If you're looking to explore another major destination in Portugal, consider Amadora, about 274 kilometres south of Porto. Roman Villa, Park Fantasia and Palácio dos Condes da Lousã are among the biggest draws.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.