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

Delta, United Airlines, and China Eastern are the most popular carriers operating from Washington to Bangkok

What airlines fly to Bangkok?

Asiana Airlines, EVA Air and Singapore Airlines are the top three most popular airlines that fly to Bangkok from State of Washington according to our data. Asiana Airlines is the first choice among our users, with 31% of people opting to fly with this airline when traveling to Bangkok. Keep in mind that there are 18 different airlines that fly to Bangkok on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to Bangkok?

Flight times from State of Washington to Bangkok vary, but if you’re flying out of Seattle and flying into Bangkok Suvarnabhumi Airport (one of the most popular routes), then the duration is 20h 15m on average. Another popular route from State of Washington to Bangkok is flying from Spokane to Bangkok Suvarnabhumi Airport, which will take roughly 24h 29m. Keep in mind that layovers or delays could extend your travel time.

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

Prices for flights from Washington to Bangkok are updated daily.

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

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

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

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 Bangkok.

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

The travel and health documents required for your trip to Bangkok 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 Bangkok. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$398 Cheap Flights from Washington to Bangkok in 2026

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Cheap round-trip flights

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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.

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

10:40 am - 4:35 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

27h 55m2 stops Vancouver Intl Tokyo Haneda

1:55 pm - 2:25 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

38h 30m1 stop Tokyo Haneda

$875ANA

Wed, Aug 12 - 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

6:52 pm - 9:35 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

24h 43m2 stops Los Angeles Hong Kong Intl

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

18h 50m1 stop Tokyo Haneda

$877United Airlines

Wed, Aug 12 - Tue, Aug 25

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

7:16 am - 1:05 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

27h 49m2 stops Los Angeles Incheon Intl

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

32h 57m2 stops Incheon Intl Los Angeles

$886Korean Air

Wed, Aug 12 - Tue, Aug 25

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

7:00 am - 5:45 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

32h 45m2 stops Los Angeles Tokyo Haneda

9:40 pm - 4:07 pmBKK Bangkok Suvarnabhumi-SEA Seattle/Tacoma Intl

32h 27m2 stops Tokyo Haneda San Francisco

$1,025Japan Airlines

Thu, Aug 13 - Sun, Aug 23

2:10 am - 11:20 amSEA Seattle/Tacoma Intl-BKK Bangkok Suvarnabhumi

19h 10m1 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

$1,070EVA Air

Wed, Aug 12 - Sun, Aug 23

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United Airlines flights from State of Washington to Bangkok

Our best United Airlines deals on State of Washington to Bangkok 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 Bangkok

Our best Singapore Airlines deals on State of Washington to Bangkok 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 Bangkok

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 Bangkok?

If you aren’t able to travel during the month of March, then book flights to Bangkok from State of Washington during October instead. Flights to Bangkok in October, while not as cheap as those in March, still average around $757.

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

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

Cheap State of Washington to Bangkok flight deals and tips

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

Fastest flight time	20h 15m
Direct flights	None

The fastest flight from State of Washington to Bangkok takes 20h 15m

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

Search flight deals

Frequently asked questions about flying from Washington to Bangkok

When did momondo last update prices for flights from Washington to Bangkok?
Prices for flights from Washington to Bangkok are updated daily.
How many operators does momondo search for flights from Washington to Bangkok?
There are 18 operators available for flights from Washington to Bangkok as of August 2026.
How old do you have to be to fly from Washington to Bangkok?
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 Bangkok.
What documentation or ID do you need to fly to Bangkok?
The travel and health documents required for your trip to Bangkok 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 Bangkok. 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 Bangkok

Compare and see reviews for airlines that fly from State of Washington to Bangkok 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
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
Delta	PriceFrom $694	Free Cancellation	Rating 7.8 8,505 reviews	Search Delta flights
United Airlines	PriceFrom $702	Free Cancellation	Rating 7.4 10,104 reviews	Search United Airlines flights

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

Yes. momondo allows you to filter the results for Washington to Bangkok flights to just show those with flexible booking policies.

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Once all potential Washington to Bangkok flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

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Cheap flights from Washington to Bangkok from $398

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Bangkok departing on 9/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from State of Washington to Bangkok

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

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

What is the cheapest month to fly to Bangkok?

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

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

What airlines fly to Bangkok?

How long does it take to fly to Bangkok?

Cheap State of Washington to Bangkok flight deals and tips

Fastest flight time

Direct flights

Frequently asked questions about flying from Washington to Bangkok

Best airlines flying from State of Washington to Bangkok

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

Why use momondo?

An easier way to manage your Bangkok trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Thailand

Fly into one of these airports located in Bangkok

Airports listed have a maximum distance of 15.4 mi from Bangkok

Fly your favorite airline to Bangkok

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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