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

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

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 25h 27m.

What airlines fly to Thailand?

Asiana Airlines, EVA Air and Singapore Airlines 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 29% of people opting to fly with this airline when traveling to Thailand. Keep in mind that there are 16 different airlines that fly to Thailand on a routine basis, so you have a few additional options to choose from.

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 16 operators available for flights from Washington to Thailand as of April 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.

$338 Cheap Flights from Washington to Thailand in 2026

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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.

10:15 am - 8:00 pm

SEA

BKK

19h 45m

1 stop

8:00 pm - 7:10 am

BKK

SEA

26h 10m

1 stop

$648Singapore Airlines

Tue, Aug 25 - Mon, Nov 2

10:15 am - 8:00 pm

SEA

BKK

19h 45m

1 stop

9:35 am - 8:10 am

BKK

SEA

36h 35m

1 stop

$665Singapore Airlines

Thu, Oct 1 - Sat, Oct 31

10:15 am - 2:15 pm

SEA

BKK

38h 00m

1 stop

12:15 pm - 8:45 am

BKK

SEA

34h 30m

1 stop

$687Singapore Airlines

Tue, Aug 25 - Mon, Sep 14

12:50 pm - 11:35 pm

SEA

BKK

20h 45m

1 stop

9:50 am - 10:40 am

BKK

SEA

38h 50m

1 stop

$741Korean Air

Sun, Apr 26 - Tue, May 12

6:05 pm - 10:10 pm

SEA

HKT

38h 05m

2 stops

11:25 pm - 10:40 am

HKT

SEA

25h 15m

1 stop

$887Korean Air

Sat, May 2 - Mon, May 11

1:55 am - 10:20 am

SEA

CNX

18h 25m

1 stop

11:20 am - 7:45 pm

CNX

SEA

22h 25m

1 stop

$895China Airlines

Thu, Sep 3 - Mon, Sep 14

1:00 pm - 10:10 pm

SEA

HKT

19h 10m

1 stop

11:25 pm - 1:11 pm

HKT

SEA

27h 46m

1 stop

$896Delta

Sun, May 3 - Mon, May 11

1:15 am - 10:20 am

SEA

CNX

19h 05m

1 stop

11:25 am - 6:10 pm

CNX

SEA

21h 45m

1 stop

$897China Airlines

Sun, Sep 27 - Mon, Nov 2

9:59 pm - 9:45 am

PDX

BKK

21h 46m

2 stops

5:30 pm - 10:44 pm

BKK

PDX

19h 14m

2 stops

$905Multiple Airlines

Mon, Oct 5 - Tue, Oct 20

5:35 pm - 12:10 pm

PDX

BKK

28h 35m

2 stops

10:50 am - 8:13 am

BKK

PDX

35h 23m

2 stops

$906Multiple Airlines

Tue, Sep 8 - Mon, Sep 21

China Airlines flights from State of Washington to Thailand

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

China Airlines

Apr 20

SEA1:15 amSeattle/Tacoma Intl

18h 30m

1 stop

BKK9:45 amBangkok Suvarnabhumi

Sep 8

BKK5:30 pmBangkok Suvarnabhumi

16h 15m

1 stop

SEA7:45 pmSeattle/Tacoma Intl

$835

China Airlines

Apr 26

SEA1:15 amSeattle/Tacoma Intl

18h 30m

1 stop

BKK9:45 amBangkok Suvarnabhumi

May 19

BKK5:30 pmBangkok Suvarnabhumi

15h 45m

1 stop

SEA7:15 pmSeattle/Tacoma Intl

$849

China Airlines

Apr 26

SEA1:15 amSeattle/Tacoma Intl

18h 30m

1 stop

BKK9:45 amBangkok Suvarnabhumi

May 19

BKK5:30 pmBangkok Suvarnabhumi

15h 45m

1 stop

SEA7:15 pmSeattle/Tacoma Intl

$857

Hainan Airlines flights from State of Washington to Thailand

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

Hainan Airlines

Apr 28

SEA11:00 amSeattle/Tacoma Intl

22h 00m

1 stop

BKK11:00 pmBangkok Suvarnabhumi

May 18

BKK12:40 amBangkok Suvarnabhumi

22h 20m

1 stop

SEA9:00 amSeattle/Tacoma Intl

$846

Hainan Airlines

Apr 18

SEA11:00 amSeattle/Tacoma Intl

35h 20m

1 stop

BKK12:20 pmBangkok Suvarnabhumi

May 25

BKK12:40 amBangkok Suvarnabhumi

22h 20m

1 stop

SEA9:00 amSeattle/Tacoma Intl

$926

Hainan Airlines

Apr 14

SEA11:00 amSeattle/Tacoma Intl

22h 00m

1 stop

BKK11:00 pmBangkok Suvarnabhumi

May 13

BKK11:05 amBangkok Suvarnabhumi

36h 00m

2 stops

SEA9:05 amSeattle/Tacoma Intl

$1,046

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Tue 8/25

10:15 am-8:00 pm

1 stop19h 45m

Bangkok Suvarnabhumi

Mon 11/2

8:00 pm-7:10 am

1 stop26h 10m

$648

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Thu 10/1

10:15 am-8:00 pm

1 stop19h 45m

Bangkok Suvarnabhumi

Sat 10/31

9:35 am-8:10 am

1 stop36h 35m

$665

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Tue 8/25

10:15 am-2:15 pm

1 stop38h 00m

Bangkok Suvarnabhumi

Mon 9/14

12:15 pm-8:45 am

1 stop34h 30m

$687

SeattleBangkok

SEA - BKK

SEABKK

Seattle/Tacoma Intl

Sun 4/26

12:50 pm-11:35 pm

1 stop20h 45m

Bangkok Suvarnabhumi

Tue 5/12

9:50 am-10:40 am

1 stop38h 50m

$741

SeattlePhuket City

SEA - HKT

SEAHKT

Seattle/Tacoma Intl

Sat 5/2

6:05 pm-10:10 pm

2 stops38h 05m

Phuket City

Mon 5/11

11:25 pm-10:40 am

1 stop25h 15m

$887

Quickest round-trip

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Thu 9/3

1:55 am-10:20 am

1 stop18h 25m

Chiang Mai

Mon 9/14

11:20 am-7:45 pm

1 stop22h 25m

$895

SeattlePhuket City

SEA - HKT

SEAHKT

Seattle/Tacoma Intl

Sun 5/3

1:00 pm-10:10 pm

1 stop19h 10m

Phuket City

Mon 5/11

11:25 pm-1:11 pm

1 stop27h 46m

$896

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Sun 9/27

1:15 am-10:20 am

1 stop19h 05m

Chiang Mai

Mon 11/2

11:25 am-6:10 pm

1 stop21h 45m

$897

PortlandBangkok

PDX - BKK

PDXBKK

Portland

Mon 10/5

9:59 pm-9:45 am

2 stops21h 46m

Bangkok Suvarnabhumi

Tue 10/20

5:30 pm-10:44 pm

2 stops19h 14m

$905

PortlandBangkok

PDX - BKK

PDXBKK

Portland

Tue 9/8

5:35 pm-12:10 pm

2 stops28h 35m

Bangkok Suvarnabhumi

Mon 9/21

10:50 am-8:13 am

2 stops35h 23m

$906

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 September is, on average, the cheapest month to fly to Thailand from State of Washington, with most prices found around $739. If you are unable to visit Thailand during the month of September, then departing from State of Washington during the month March is also very affordable. Most momondo users find prices during this month for around $742.

How far in advance should I book a flight 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 $864 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 $732 on momondo.

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

You could potentially save up to 38% 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	18h 55m
Direct flights	None

The fastest flight from State of Washington to Thailand takes 18h 55m

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

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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 16 operators available for flights from Washington to Thailand as of April 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 7.3 985 reviews	Search Philippine Airlines flights
Korean Air	PriceFrom $418	Free Cancellation	Rating 8.4 1,205 reviews	Search Korean Air flights
Singapore Airlines	PriceFrom $510	Free Cancellation	Rating 8.2 1,491 reviews	Search Singapore Airlines flights
Delta	PriceFrom $544	Free Cancellation	Rating 7.9 8,394 reviews	Search Delta flights
Air Canada	PriceFrom $623	Free Cancellation	Rating 7.1 10,913 reviews	Search Air Canada flights
Asiana Airlines	PriceFrom $627	Free Cancellation	Rating 8.1 515 reviews	Search Asiana Airlines flights
ANA	PriceFrom $680	Free Cancellation	Rating 8.4 1,169 reviews	Search ANA flights
United Airlines	PriceFrom $697	Free Cancellation	Rating 7.4 9,559 reviews	Search United Airlines flights
Cathay Pacific	PriceFrom $704	Free Cancellation	Rating 7.6 1,268 reviews	Search Cathay Pacific flights
China Airlines	PriceFrom $712	Free Cancellation	Rating 8.3 816 reviews	Search China 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.