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$451+ Cheap flights from Dulles Intl (IAD) to Bangkok

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BKK
Jul 16 — Jul 231
Wed 7/16
Wed 7/23
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Bangkok are usually found in September or August, booked 90 days in advance, depart on a Saturday or Tuesday and return on a Sunday

Cheap flight deals from Dulles Intl to Bangkok

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Bangkok (TH1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 11, 2025.

Round-trip from

$927
(United Airlines)

One-way from

$451
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$1,453
From Washington, D.C. Dulles Intl to Bangkok
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One-way flight from Washington, D.C. Dulles Intl to Bangkok
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Highest demand for flights based on searches. 9% potential increase in price ($126 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Dulles Intl to Bangkok

Cheapest flights from Dulles Intl to Bangkok
Explore the most affordable flight options available from Dulles Intl to Bangkok. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 11, 2025.

This United Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/288:20 amIAD - BKK
2 stops28h 35mUnited Airlines
Tue 9/309:35 amBKK - IAD
1 stop41h 00mUnited Airlines
Deal found 7/10$927
This Delta deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:00 amIAD - BKK
2 stops28h 20mDelta
Tue 11/251:00 amBKK - IAD
2 stops34h 15mDelta
Deal found 7/10$928
This Air China deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air China is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/710:00 pmIAD - BKK
1 stop38h 10mAir China
Mon 11/247:30 pmBKK - IAD
1 stop35h 00mAir China
Deal found 7/10$929
This KAYAK deal was found by Cheapflights users on 7/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/316:15 amIAD - BKK
2 stops30h 10mKorean Air
Sun 9/2111:30 pmBKK - IAD
2 stops35h 43mKorean Air
Deal found 7/8$931
This Ovago deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:25 pmIAD - BKK
1 stop29h 10mANA
Tue 10/217:00 amBKK - IAD
2 stops24h 55mANA
Deal found 7/9$939
This Turkish Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/31:30 pmIAD - BKK
1 stop26h 50mTurkish Airlines
Thu 11/2010:10 amBKK - IAD
1 stop45h 05mTurkish Airlines
Deal found 7/10$943
This oojo deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/110:05 pmIAD - BKK
1 stop22h 15mEtihad Airways
Fri 10/172:55 amBKK - IAD
1 stop24h 15mEtihad Airways
Deal found 7/9$948
This ANA deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ANA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1312:15 pmIAD - BKK
1 stop30h 45mMultiple Airlines
Thu 10/309:25 amBKK - IAD
2 stops24h 33mMultiple Airlines
Deal found 7/9$961
This Mytrip deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1211:00 amIAD - DMK
2 stops30h 40mMultiple Airlines
Mon 11/39:10 pmDMK - IAD
2 stops30h 55mMultiple Airlines
Deal found 7/10$1,094

Cheapflights Fare Finder

Customize your flight search to find flights from Dulles Intl to Bangkok that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 11, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Bangkok that are best for you.

Fly from

Dulles Intl

Fly to

Bangkok

Route

Depart

Return

Price

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Mon 7/28

6:32 am-11:55 pm

2 stops30h 23m

Bangkok Suvarnabhumi

Wed 10/1

9:35 am-10:05 am

1 stop35h 30m

$927

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Tue 8/26

7:30 am-9:45 pm

2 stops27h 15m

Bangkok Suvarnabhumi

Mon 9/8

9:50 am-11:21 pm

2 stops24h 31m

$928

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Fri 8/22

11:00 pm-6:10 pm

1 stop32h 10m

Bangkok Suvarnabhumi

Mon 9/8

7:35 pm-7:30 pm

1 stop34h 55m

$929

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Sun 8/31

6:15 am-11:25 pm

2 stops30h 10m

Bangkok Suvarnabhumi

Sun 9/21

11:30 pm-12:13 am

2 stops35h 43m

$931

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Mon 10/6

12:25 pm-4:35 am

1 stop29h 10m

Bangkok Suvarnabhumi

Tue 10/21

7:00 am-8:55 pm

2 stops24h 55m

$939

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Wed 9/10

1:30 pm-5:15 am

1 stop28h 45m

Bangkok Suvarnabhumi

Thu 9/18

6:45 am-11:45 am

1 stop40h 00m

$943

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Wed 10/1

10:05 pm-7:20 am

1 stop22h 15m

Bangkok Suvarnabhumi

Fri 10/17

2:55 am-4:10 pm

1 stop24h 15m

$948

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Tue 8/12

9:50 am-9:45 pm

2 stops24h 55m

Bangkok Suvarnabhumi

Fri 8/22

9:50 am-11:40 pm

2 stops24h 50m

$961

Washington, D.C.Bangkok

IAD - DMK

IADDMK

Washington, D.C. Dulles Intl

Fri 9/12

11:00 am-4:40 am

2 stops30h 40m

Bangkok Don Mueang Intl

Mon 11/3

9:10 pm-4:05 pm

2 stops30h 55m

$1,094

Washington, D.C.Bangkok

IAD - BKK

IADBKK

Washington, D.C. Dulles Intl

Sat 8/23

9:40 pm-10:40 pm

2 stops38h 00m

$451

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/8

Showing 1-10 of 19 results
1
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Best time to book a flight from Dulles Intl to Bangkok

Have a flexible travel schedule? Discover the best time to fly to Bangkok from Dulles Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Bangkok

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Bangkok?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Bangkok. Price data was last updated on June 27, 2025.

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to Bangkok may vary depending on when you book. For the best chance of a lower fare, look to book 90 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Bangkok?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Bangkok (average of $951). Flying from Washington, D.C. Dulles Intl Airport to Bangkok in December is currently the most expensive (average of $1,573). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to BKK?

Find hourly flight availability from Dulles Intl to Bangkok. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 11, 2025.

A simple way to save on the total cost of your ticket is to fly from Washington, D.C. Dulles Intl Airport to Bangkok in the afternoon. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Bangkok?

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Bangkok. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Bangkok flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Bangkok

Get insights into the airlines that provide service to Bangkok. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Bangkok. Reviews last updated July 11, 2025.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Bangkok, such as Korean Air, ANA, and Japan Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,105 reviews

Crew

8.7

Boarding

8.5

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Korean Air
8.4
Very good
1,105 reviews
Korean Air
8.4
Very good
1,105 reviews

Crew

8.7

Boarding

8.5

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
ANA
8.4
Very good
899 reviews
Korean Air
8.4
Very good
1,105 reviews

Crew

8.7

Boarding

8.5

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Japan Airlines
8.3
Very good
1,511 reviews
Korean Air
8.4
Very good
1,105 reviews

Crew

8.7

Boarding

8.5

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Delta
8.0
Very good
7,951 reviews
Korean Air
8.4
Very good
1,105 reviews

Crew

8.7

Boarding

8.5

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Qatar Airways
7.4
Good
3,590 reviews
Korean Air
8.4
Very good
1,105 reviews

Crew

8.7

Boarding

8.5

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Bangkok. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Bangkok round-trip?

    United Airlines, at $927, was found to be the cheapest airline from Washington, D.C. Dulles Intl Airport to Bangkok.Alternate airlines to your destination round-trip include Delta and Air China. United Airlines is priced at 25% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Bangkok one-way?

    For one-way options, check prices for IndiGo. According to our data, you can fly for as low as $451. Users have also found prices from $452 and $497 on Korean Air and Qatar Airways, respectively.

  • Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to Bangkok?

    Most of the time, Washington, D.C. Dulles Intl Airport to Bangkok flights that have layovers will stop in Doha. Doha is followed by Istanbul in terms of the most popular layover location on flights from Washington, D.C. Dulles Intl Airport to Bangkok. Seoul ranks third in terms of the most popular layover location on Washington, D.C. Dulles Intl Airport to Bangkok flights.

  • What are some popular things to do or see while on a layover in Doha?

    Museum of Islamic Art, Katara Cultural Village, and Aspire Tower are currently the most popular points of interest in Doha at the moment. Those on a layover in Doha interested in visiting Museum of Islamic Art, Katara Cultural Village, or Aspire Tower can do so by traveling 5.2 mi, 8.7 mi, and 10.6 mi, respectively from Doha Hamad Intl. Those landing in Doha looking to spend some time exploring during their layover can rent a car for about $24 per day.

  • What are some popular points of interest to see during a layover in Istanbul?

    The majority of Istanbul visitors spend their time at Taksim Square, Sultan Ahmet Camii, and Beyazit Meydani. Taksim Square, Sultan Ahmet Camii, and Beyazit Meydani can be visited by traveling about 20.8 mi, 22.3 mi, and 21.7 mi respectively from Istanbul. Travelers can rent a car at Istanbul for an average daily rate of $48 to make sightseeing during their layover a little easier.

  • What are points of interest worth seeing during a layover in Seoul?

    Most Seoul visitors opt to spend their time at Dongdaemun Market, Lotte World, and Bukchon Hanok Village. Dongdaemun Market, Lotte World, and Bukchon Hanok Village are located about 31.6 mi, 35.7 mi, and 30.6 mi, respectively from Incheon Intl. Those landing in Seoul looking to spend some time exploring during their layover can rent a car for about $58 per day.

  • Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to Bangkok flights?

    Flights departing from Washington, D.C. Dulles Intl Airport and landing in Bangkok layover in Atlanta least frequently. Atlanta is followed by Tokyo in terms of the least popular layover location on flights from Washington, D.C. Dulles Intl Airport to Bangkok. Jeddah sees the third fewest flights with layovers for the Washington, D.C. Dulles Intl Airport to Bangkok route.

  • Can I find deals for flights from Dulles Intl to Bangkok that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Bangkok flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Bangkok?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Bangkok.

  • Can I find deals for business class flights from Dulles Intl to Bangkok?

    Yes. Cheapflights offers flight deals from Dulles Intl to Bangkok by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Bangkok?

    Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Bangkok (average of $951). Flying from Washington, D.C. Dulles Intl Airport to Bangkok in December is currently the most expensive (average of $1,573). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 10 airlines flying from Dulles Intl to Bangkok

Discover the top 10 airlines that operate flights from Dulles Intl to Bangkok. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air ChinaCheapest$565Average$629FlexibilityNo cancel feeOn-time67%
SAUDIACheapest$596Average$843FlexibilityNo cancel feeOn-time86%
Air IndiaCheapest$700Average$841FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$807Average$1,414FlexibilityNo cancel feeOn-time81%
ANACheapest$903Average$1,303FlexibilityNo cancel feeOn-time80%
Turkish AirlinesCheapest$918Average$1,128FlexibilityNo cancel feeOn-time77%
Etihad AirwaysCheapest$919Average$1,146FlexibilityNo cancel feeOn-time75%
DeltaCheapest$928Average$1,136FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$936Average$1,416FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$939Average$1,294FlexibilityNo cancel feeOn-time69%

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