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

Delta, United Airlines, and Korean Air are the most popular carriers operating from Washington to Thailand

What airlines fly to Thailand?

Asiana Airlines, Singapore Airlines and EVA Air are the top three most popular airlines that fly to Thailand from State of Washington according to our data. Asiana Airlines is the first choice among our users, with 28% of people opting to fly with this airline when traveling to Thailand. Keep in mind that there are 18 different airlines that fly to Thailand on a routine basis, so you have a few additional options to choose from.

How long is the flight from State of Washington to Thailand?

The flight from State of Washington to Thailand depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Seattle (a popular airport in State of Washington) to Bangkok Suvarnabhumi Airport (the most popular airport in Thailand), then the flight time is 20h 15m on average. If you fly from Spokane (another popular airport in State of Washington) to Bangkok Suvarnabhumi Airport, then the average flight time is 24h 29m.

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

Prices for flights from Washington to Thailand are updated daily.

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

There are 18 operators available for flights from Washington to Thailand as of August 2026.

How old do you have to be to fly from Washington to Thailand?

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 Thailand.

What documentation or ID do you need to fly to Thailand?

The travel and health documents required for your trip to Thailand can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Thailand. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$398 Cheap Flights from Washington to Thailand in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington to Thailand

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:45 am - 5:00 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

41h 15m1 stop Singapore Changi

9:40 am - 7:10 amBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

36h 30m1 stop Singapore Changi

$661Singapore Airlines

Tue, Nov 3 - Tue, Nov 17

8:45 am - 5:00 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

41h 15m1 stop Singapore Changi

9:40 am - 7:10 amBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

36h 30m1 stop Singapore Changi

$665Singapore Airlines

Tue, Nov 3 - Sat, Nov 14

3:00 pm - 5:05 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

24h 05m1 stop Vancouver Intl

7:05 am - 2:22 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

21h 17m1 stop Vancouver Intl

$741Air Canada

Mon, Sep 7 - Mon, Sep 21

12:10 am - 11:15 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

20h 05m1 stop Incheon Intl

12:20 pm - 1:55 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

16h 35m1 stop Incheon Intl

$752Asiana Airlines

Thu, Nov 5 - Sun, Nov 22

10:40 am - 5:05 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

28h 25m1 stop Vancouver Intl

7:05 am - 2:22 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

21h 17m1 stop Vancouver Intl

$753Air Canada

Wed, Sep 2 - Wed, Sep 30

10:40 am - 5:05 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

28h 25m1 stop Vancouver Intl

3:45 pm - 2:22 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

36h 37m2 stops Hong Kong Intl Vancouver Intl

$775Multiple Airlines

Mon, Sep 7 - Mon, Sep 21

12:10 am - 10:40 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

20h 30m1 stop Incheon Intl

1:35 am - 3:15 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

27h 40m1 stop Incheon Intl

$776Asiana Airlines

Tue, Sep 8 - Mon, Sep 14

10:30 am - 11:00 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

22h 30m2 stops Calgary Tokyo Narita

11:45 am - 12:23 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

38h 38m2 stops Incheon Intl San Francisco

$777Multiple Airlines

Wed, Sep 2 - Wed, Sep 23

11:00 am - 12:20 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

35h 20m1 stop Beijing Capital

12:25 am - 9:00 amBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

22h 35m1 stop Beijing Capital

$810Hainan Airlines

Sat, Sep 5 - Fri, Sep 11

11:00 am - 11:00 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

22h 00m1 stop Beijing Capital

1:50 pm - 9:00 amBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

33h 10m1 stop Beijing Capital

$810Hainan Airlines

Tue, Sep 1 - Fri, Sep 11

Cheap last minute flights

Enter your travel dates to find the best prices.

2:10 am - 1:05 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

20h 55m1 stop Taipei City Taiwan Taoyuan Intl

4:45 pm - 7:50 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

17h 05m1 stop Taipei City Taiwan Taoyuan Intl

$869EVA Air

Tue, Aug 11 - Tue, Aug 25

4:30 pm - 4:35 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

22h 05m1 stop Tokyo Haneda

9:35 am - 2:25 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

18h 50m1 stop Tokyo Haneda

$872United Airlines

Wed, Aug 12 - Tue, Aug 25

4:30 pm - 5:55 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

23h 25m1 stop Tokyo Haneda

9:35 pm - 6:32 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

34h 57m2 stops Tokyo Haneda Vancouver Intl

$874ANA

Thu, Aug 13 - Tue, Aug 18

4:45 pm - 9:35 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

26h 50m2 stops Los Angeles Hong Kong Intl

9:35 am - 2:25 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

18h 50m1 stop Tokyo Haneda

$876United Airlines

Tue, Aug 11 - Wed, Aug 19

2:10 am - 1:05 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

20h 55m1 stop Taipei City Taiwan Taoyuan Intl

4:45 pm - 7:50 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

17h 05m1 stop Taipei City Taiwan Taoyuan Intl

$877EVA Air

Tue, Aug 11 - Tue, Aug 25

1:20 pm - 1:05 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

21h 45m1 stop Incheon Intl

9:50 am - 9:59 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

26h 09m2 stops Incheon Intl Las Vegas Harry Reid Intl

$881Korean Air

Tue, Aug 11 - Tue, Aug 18

1:20 pm - 1:05 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

21h 45m1 stop Incheon Intl

9:40 pm - 4:37 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

32h 57m2 stops Incheon Intl Los Angeles

$881Korean Air

Wed, Aug 12 - Tue, Aug 25

4:30 pm - 5:55 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

23h 25m1 stop Tokyo Haneda

9:35 pm - 2:25 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

30h 50m1 stop Tokyo Haneda

$882ANA

Thu, Aug 13 - Tue, Aug 18

7:16 am - 11:35 pmSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

26h 19m2 stops Los Angeles Incheon Intl

9:40 pm - 4:37 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

32h 57m2 stops Incheon Intl Los Angeles

$1,001Delta

Wed, Aug 12 - Tue, Aug 25

1:05 pm - 1:05 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

22h 00m1 stop Incheon Intl

2:35 am - 1:37 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

25h 02m1 stop Incheon Intl

$1,090Delta

Tue, Aug 11 - Thu, Aug 20

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

United Airlines flights from State of Washington to Thailand

Our best United Airlines deals on State of Washington to Thailand flight tickets

United Airlines

Aug 12

SEA4:30 pmSeattle/Tacoma Intl

22h 05m

1 stop

BKK4:35 amBangkok Suvarnabhumi

Aug 25

BKK9:35 amBangkok Suvarnabhumi

18h 50m

1 stop

SEA2:25 pmSeattle/Tacoma Intl

$872

United Airlines

Aug 11

SEA4:45 pmSeattle/Tacoma Intl

26h 50m

2 stops

BKK9:35 amBangkok Suvarnabhumi

Aug 19

BKK9:35 amBangkok Suvarnabhumi

18h 50m

1 stop

SEA2:25 pmSeattle/Tacoma Intl

$876

United Airlines

Aug 12

SEA6:52 pmSeattle/Tacoma Intl

24h 43m

2 stops

BKK9:35 amBangkok Suvarnabhumi

Aug 25

BKK9:35 amBangkok Suvarnabhumi

18h 50m

1 stop

SEA2:25 pmSeattle/Tacoma Intl

$877

Singapore Airlines flights from State of Washington to Thailand

Our best Singapore Airlines deals on State of Washington to Thailand flight tickets

Singapore Airlines

Nov 3

SEA8:45 amSeattle/Tacoma Intl

41h 15m

1 stop

BKK5:00 pmBangkok Suvarnabhumi

Nov 17

BKK9:40 amBangkok Suvarnabhumi

36h 30m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$661

Singapore Airlines

Nov 3

SEA8:45 amSeattle/Tacoma Intl

41h 15m

1 stop

BKK5:00 pmBangkok Suvarnabhumi

Nov 14

BKK9:40 amBangkok Suvarnabhumi

36h 30m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$665

Singapore Airlines

Oct 29

SEA9:45 amSeattle/Tacoma Intl

38h 50m

1 stop

BKK2:35 pmBangkok Suvarnabhumi

Nov 13

BKK9:40 amBangkok Suvarnabhumi

36h 30m

1 stop

SEA7:10 amSeattle/Tacoma Intl

$667

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Tue 11/3

8:45 am-5:00 pm

1 stop41h 15m

Bangkok Suvarnabhumi

Tue 11/17

9:40 am-7:10 am

1 stop36h 30m

$661

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Tue 11/3

8:45 am-5:00 pm

1 stop41h 15m

Bangkok Suvarnabhumi

Sat 11/14

9:40 am-7:10 am

1 stop36h 30m

$665

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Mon 9/7

3:00 pm-5:05 am

1 stop24h 05m

Bangkok Suvarnabhumi

Mon 9/21

7:05 am-2:22 pm

1 stop21h 17m

$741

Quickest round-trip

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Thu 11/5

12:10 am-11:15 am

1 stop20h 05m

Bangkok Suvarnabhumi

Sun 11/22

12:20 pm-1:55 pm

1 stop16h 35m

$752

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Wed 9/2

10:40 am-5:05 am

1 stop28h 25m

Bangkok Suvarnabhumi

Wed 9/30

7:05 am-2:22 pm

1 stop21h 17m

$753

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Mon 9/7

10:40 am-5:05 am

1 stop28h 25m

Bangkok Suvarnabhumi

Mon 9/21

3:45 pm-2:22 pm

2 stops36h 37m

$775

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Tue 9/8

12:10 am-10:40 am

1 stop20h 30m

Bangkok Suvarnabhumi

Mon 9/14

1:35 am-3:15 pm

1 stop27h 40m

$776

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Wed 9/2

10:30 am-11:00 pm

2 stops22h 30m

Bangkok Suvarnabhumi

Wed 9/23

11:45 am-12:23 pm

2 stops38h 38m

$777

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Sat 9/5

11:00 am-12:20 pm

1 stop35h 20m

Bangkok Suvarnabhumi

Fri 9/11

12:25 am-9:00 am

1 stop22h 35m

$810

SeattleBangkok

SEA Seattle/Tacoma Intl - BKK Bangkok Suvarnabhumi

SEABKK

Seattle/Tacoma Intl

Tue 9/1

11:00 am-11:00 pm

1 stop22h 00m

Bangkok Suvarnabhumi

Fri 9/11

1:50 pm-9:00 am

1 stop33h 10m

$810

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 Thailand

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

Other information

What is the cheapest month to fly to Thailand?

The month of March is, on average, the cheapest month to fly to Thailand from State of Washington, with most prices found around $754. If you are unable to visit Thailand during the month of March, then departing from State of Washington during the month October is also very affordable. Most momondo users find prices during this month for around $771.

How far in advance should I book a flight from Washington to Thailand?

You are more likely to see cheaper flights to Thailand from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Thailand for around $893 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Thailand from State of Washington for as low as $740 on momondo.

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

You could potentially save up to 10% on your flight if you consider stops on a State of Washington to Thailand flight.

Cheap State of Washington to Thailand flight deals and tips

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

Fastest flight time	20h 05m
Direct flights	None

The fastest flight from State of Washington to Thailand takes 20h 05m

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

Search flight deals

Frequently asked questions about flying from Washington to Thailand

When did momondo last update prices for flights from Washington to Thailand?
Prices for flights from Washington to Thailand are updated daily.
How many operators does momondo search for flights from Washington to Thailand?
There are 18 operators available for flights from Washington to Thailand as of August 2026.
How old do you have to be to fly from Washington to Thailand?
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 Thailand.
What documentation or ID do you need to fly to Thailand?
The travel and health documents required for your trip to Thailand can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Thailand. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from State of Washington to Thailand

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

Airline	Rating	Free Cancellation	Price
Philippine Airlines	PriceFrom $149	Free Cancellation	Rating 7.3 1,014 reviews	Search Philippine Airlines flights
Hainan Airlines	PriceFrom $385	Free Cancellation	Rating 8.3 68 reviews	Search Hainan Airlines flights
Delta	PriceFrom $459	Free Cancellation	Rating 7.8 8,505 reviews	Search Delta flights
Singapore Airlines	PriceFrom $510	Free Cancellation	Rating 8.2 1,584 reviews	Search Singapore Airlines flights
Qatar Airways	PriceFrom $577	Free Cancellation	Rating 7.4 3,740 reviews	Search Qatar Airways flights
Asiana Airlines	PriceFrom $623	Free Cancellation	Rating 8.1 556 reviews	Search Asiana Airlines flights
Air Canada	PriceFrom $623	Free Cancellation	Rating 7.1 11,462 reviews	Search Air Canada flights
Korean Air	PriceFrom $652	Free Cancellation	Rating 8.4 1,221 reviews	Search Korean Air flights
ANA	PriceFrom $690	Free Cancellation	Rating 8.3 1,294 reviews	Search ANA flights
United Airlines	PriceFrom $702	Free Cancellation	Rating 7.4 10,104 reviews	Search United Airlines flights

Why use momondo?

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

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

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

Yes. momondo enables you to select and highlight flights to Thailand from Washington with this policy.

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

momondo helps you find the best flight between Washington and Thailand by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are not ready to book a flight from Washington to Thailand now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Thailand and let you know when they change.