What airlines fly to Porto?

KLM, Delta and United Airlines are the top three most popular airlines that fly to Porto from State of Washington according to our data. KLM is the first choice among our users, with 31% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 5 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Washington to Porto?

British Airways and Air Canada are the most popular carriers operating from Washington to Porto

When did momondo last update prices for flights from Washington to Porto Airport?

Prices for flights from Washington to Porto Airport are updated daily.

How many operators does momondo search for flights from Washington to Porto Airport?

There are 5 operators available for flights from Washington to Porto Airport as of January 2026.

How old do you have to be to fly from Washington to Porto Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to Porto Airport.

What documentation or ID do you need to fly to Porto Airport?

The travel and health documents you'll need for your trip to Porto Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$255 Cheap Flights from Washington to Porto in 2026

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Find the cheapest flights from Washington to Porto

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:00 am - 6:30 pm

SEA

OPO

26h 30m

2 stops

1:45 pm - 1:20 pm

OPO

SEA

31h 35m

1 stop

$478Multiple Airlines

mar., feb. 24 - mar., mar. 3

8:00 am - 6:30 pm

SEA

OPO

26h 30m

2 stops

1:45 pm - 1:20 pm

OPO

SEA

31h 35m

1 stop

$479Multiple Airlines

mar., feb. 24 - mar., mar. 3

6:44 am - 7:40 am

SEA

OPO

16h 56m

2 stops

8:20 am - 11:04 pm

OPO

SEA

22h 44m

2 stops

$481Iberia

mar., feb. 24 - mar., mar. 3

2:10 pm - 10:30 am

SEA

OPO

36h 20m

1 stop

9:55 am - 12:35 pm

OPO

SEA

33h 40m

1 stop

$482Multiple Airlines

dom., mar. 1 - mar., mar. 10

8:00 am - 10:30 am

SEA

OPO

18h 30m

2 stops

5:00 am - 11:35 am

OPO

SEA

14h 35m

1 stop

$484Delta

mar., feb. 24 - mar., mar. 3

7:00 am - 10:30 am

PDX

OPO

20h 30m

2 stops

11:15 am - 12:25 pm

OPO

PDX

32h 10m

1 stop

$485Delta

mar., mar. 10 - mar., mar. 17

3:05 pm - 10:25 pm

SEA

OPO

23h 20m

1 stop

11:15 am - 11:35 am

OPO

SEA

32h 20m

1 stop

$485KLM

mar., feb. 24 - mar., mar. 3

3:05 pm - 3:25 pm

SEA

OPO

16h 20m

1 stop

5:00 am - 11:35 am

OPO

SEA

14h 35m

1 stop

$486KLM

mar., feb. 24 - mar., mar. 3

9:00 am - 9:30 am

SEA

OPO

16h 30m

2 stops

12:30 pm - 12:59 am

OPO

SEA

20h 29m

2 stops

$487United Airlines

mar., feb. 24 - mar., mar. 3

9:00 am - 9:30 am

SEA

OPO

16h 30m

2 stops

12:30 pm - 12:59 am

OPO

SEA

20h 29m

2 stops

$488United Airlines

mar., feb. 24 - mar., mar. 3

Lufthansa flights from State of Washington to Porto

Our best Lufthansa deals on State of Washington to Porto flight tickets

Lufthansa

Feb 26

SEA2:00 pmSeattle/Tacoma Intl

16h 45m

1 stop

OPO2:45 pmPorto

Mar 4

OPO6:00 amPorto

21h 03m

2 stops

SEA7:03 pmSeattle/Tacoma Intl

$492

Lufthansa

Apr 7

PDX7:15 amPortland

32h 10m

2 stops

OPO11:25 pmPorto

Apr 24

OPO6:00 amPorto

24h 29m

2 stops

PDX10:29 pmPortland

$496

Lufthansa

Apr 8

PDX7:15 amPortland

32h 10m

2 stops

OPO11:25 pmPorto

Apr 21

OPO11:05 amPorto

21h 39m

2 stops

PDX12:44 amPortland

$497

British Airways flights from State of Washington to Porto

Our best British Airways deals on State of Washington to Porto flight tickets

British Airways

Feb 27

PDX6:40 amPortland

28h 20m

2 stops

OPO7:00 pmPorto

Mar 12

OPO8:20 amPorto

22h 55m

2 stops

PDX12:15 amPortland

$520

British Airways

Mar 9

PDX6:45 pmPortland

15h 50m

1 stop

OPO5:35 pmPorto

Mar 17

OPO6:25 pmPorto

29h 30m

1 stop

PDX4:55 pmPortland

$535

British Airways

Feb 27

PDX5:40 amPortland

29h 20m

2 stops

OPO7:00 pmPorto

Mar 12

OPO5:35 pmPorto

30h 20m

1 stop

PDX4:55 pmPortland

$555

Fly from

Fly to

Route

Depart

Return

Price

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

8:00 am-6:30 pm

2 stops26h 30m

Porto

mar. 3/3

1:45 pm-1:20 pm

1 stop31h 35m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

8:00 am-6:30 pm

2 stops26h 30m

Porto

mar. 3/3

1:45 pm-1:20 pm

1 stop31h 35m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

6:44 am-7:40 am

2 stops16h 56m

Porto

mar. 3/3

8:20 am-11:04 pm

2 stops22h 44m

$481

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

dom. 3/1

2:10 pm-10:30 am

1 stop36h 20m

Porto

mar. 3/10

9:55 am-12:35 pm

1 stop33h 40m

$482

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

8:00 am-10:30 am

2 stops18h 30m

Porto

mar. 3/3

5:00 am-11:35 am

1 stop14h 35m

$484

PortlandPorto

PDX - OPO

PDXOPO

Portland

mar. 3/10

7:00 am-10:30 am

2 stops20h 30m

Porto

mar. 3/17

11:15 am-12:25 pm

1 stop32h 10m

$485

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

3:05 pm-10:25 pm

1 stop23h 20m

Porto

mar. 3/3

11:15 am-11:35 am

1 stop32h 20m

$485

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

3:05 pm-3:25 pm

1 stop16h 20m

Porto

mar. 3/3

5:00 am-11:35 am

1 stop14h 35m

$486

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

9:00 am-9:30 am

2 stops16h 30m

Porto

mar. 3/3

12:30 pm-12:59 am

2 stops20h 29m

$487

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

9:00 am-9:30 am

2 stops16h 30m

Porto

mar. 3/3

12:30 pm-12:59 am

2 stops20h 29m

$488

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from State of Washington to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Porto?

The month of January is, on average, the cheapest month to fly to Porto from State of Washington, with most prices found around $485. If you aren’t able to travel during the month of January, then book flights to Porto from State of Washington during March instead. Flights to Porto in March, while not as cheap as those in January, still average around $697.

How far in advance should I book a flight to Porto?

You are more likely to see cheaper flights to Porto from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $950 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from State of Washington for as low as $730 on momondo.

Can stopping save me money on State of Washington to Porto flights?

You could potentially save up to 25% on your flight if you consider stops on a State of Washington to Porto flight.

Cheap State of Washington to Porto flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Porto

Fastest flight time	13h 40m
Direct flights	None

The fastest flight from State of Washington to Porto takes 13h 40m

There are no direct flights from State of Washington to Porto. There are no popular flight routes from State of Washington to Porto.

Search flight deals

When did momondo last update prices for flights from Washington to Porto Airport?
Prices for flights from Washington to Porto Airport are updated daily.
How many operators does momondo search for flights from Washington to Porto Airport?
There are 5 operators available for flights from Washington to Porto Airport as of January 2026.
How old do you have to be to fly from Washington to Porto Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to Porto Airport.
What documentation or ID do you need to fly to Porto Airport?
The travel and health documents you'll need for your trip to Porto Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from State of Washington to Porto

Compare and see reviews for airlines that fly from State of Washington to Porto with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $490	Free Cancellation	Rating 7.7 1,443 reviews	Search KLM flights
Delta	PriceFrom $580	Free Cancellation	Rating 7.9 8,127 reviews	Search Delta flights
Lufthansa	PriceFrom $588	Free Cancellation	Rating 6.8 7,756 reviews	Search Lufthansa flights
United Airlines	PriceFrom $664	Free Cancellation	Rating 7.4 9,215 reviews	Search United Airlines flights
Turkish Airlines	PriceFrom $665	Free Cancellation	Rating 7.3 4,208 reviews	Search Turkish Airlines flights

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Mira

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Why use momondo?

Why should I use momondo to find a flight deal from Washington to Porto?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington to Porto. momondo saves you time and could save you money on your trip.

Can I find flights from Washington to Porto with flexible booking policies on momondo?

momondo does allow users to show only those flights to Porto from Washington which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Washington to Porto?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington to Porto.

I’m not ready to book a flight from Washington to Porto right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington to Porto flights. All you need is a valid email address and we will do the rest; it is that quick and easy.