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$447+ Cheap flights from Reagan-National (DCA) to Thailand

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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — BKK
Feb 5 — Feb 121
Thu 2/5
Thu 2/12
1 adult, Economy
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Cheap flight deals from Reagan-National to Thailand

Keep the following information in mind while searching for Reagan-National to Thailand flight deals. Data was last updated January 6, 2026.

Round-trip from

$929
(Delta)

One-way from

$447
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$1,054
From Washington, D.C. Reagan-National to Thailand
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One-way flight from Washington, D.C. Reagan-National to Thailand
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Highest demand for flights based on searches. 7% potential increase in price ($91 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($44 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from Reagan-National to Thailand

Cheapest flights from Reagan-National to Thailand
Explore the most affordable flight options available from Reagan-National to Thailand. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 6, 2026.

This Delta deal was found by Cheapflights users on 1/5. 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 3/56:59 amDCA - BKK
2 stops29h 46mDelta
Sun 3/1512:55 amBKK - DCA
2 stops32h 56mDelta
Deal found 1/5$929
This United Airlines deal was found by Cheapflights users on 1/4. 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.
Sun 1/255:59 pmDCA - BKK
2 stops47h 11mUnited Airlines
Wed 2/189:10 amBKK - DCA
2 stops25h 42mUnited Airlines
Deal found 1/4$934
This Korean Air deal was found by Cheapflights users on 1/6. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/26:59 amDCA - BKK
2 stops29h 56mKorean Air
Wed 2/1812:55 amBKK - DCA
2 stops27h 32mKorean Air
Deal found 1/6$935
This CheapOair deal was found by Cheapflights users on 1/4. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/26:59 amDCA - BKK
2 stops29h 56mKorean Air
Mon 2/99:30 pmBKK - DCA
2 stops28h 23mKorean Air
Deal found 1/4$936
This United Airlines deal was found by Cheapflights users on 1/5. 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.
Wed 9/911:30 amDCA - BKK
3 stops35h 15mUnited Airlines
Mon 9/217:00 amBKK - DCA
2 stops25h 53mUnited Airlines
Deal found 1/5$937
This United Airlines deal was found by Cheapflights users on 1/5. 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.
Wed 4/87:00 amDCA - BKK
2 stops29h 55mUnited Airlines
Mon 4/207:00 amBKK - DCA
2 stops26h 15mUnited Airlines
Deal found 1/5$940
This United Airlines deal was found by Cheapflights users on 1/6. 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.
Tue 4/143:30 pmDCA - BKK
3 stops31h 15mUnited Airlines
Thu 4/307:00 amBKK - DCA
2 stops26h 17mUnited Airlines
Deal found 1/6$941
This United Airlines deal was found by Cheapflights users on 1/6. 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.
Thu 4/161:00 pmDCA - BKK
3 stops33h 45mUnited Airlines
Thu 4/307:00 amBKK - DCA
2 stops26h 17mUnited Airlines
Deal found 1/6$945
This United Airlines deal was found by Cheapflights users on 1/5. 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.
Tue 3/107:00 amDCA - BKK
2 stops35h 10mUnited Airlines
Wed 4/83:40 pmBKK - DCA
3 stops35h 24mUnited Airlines
Deal found 1/5$946
This United Airlines deal was found by Cheapflights users on 1/6. 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.
Tue 1/277:59 pmDCA - BKK
2 stops40h 21mUnited Airlines
Mon 2/94:55 pmBKK - DCA
3 stops35h 02mUnited Airlines
Deal found 1/6$948
This United Airlines deal was found by Cheapflights users on 1/4. 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 1/266:00 amDCA - BKK
2 stops30h 20mUnited Airlines
Mon 2/24:55 pmBKK - DCA
3 stops32h 54mUnited Airlines
Deal found 1/4$949
This oojo deal was found by Cheapflights users on 1/5. 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 11/189:59 amDCA - HKT
2 stops36h 11mSingapore Airlines
Wed 11/258:15 pmHKT - DCA
2 stops37h 44mSingapore Airlines
Deal found 1/5$1,015

Cheapflights Fare Finder

 
Customize your flight search to find flights from Reagan-National to Thailand 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 January 6, 2026.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Thailand that are best for you.

Fly from

Reagan-National

Fly to

Thailand

Route

Depart

Return

Price

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Tue 2/17

7:35 am-12:45 am

2 stops29h 10m

Bangkok Suvarnabhumi

Sun 3/15

12:55 am-4:35 pm

2 stops26h 40m

$929

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Mon 2/2

7:35 am-9:30 pm

2 stops25h 55m

Bangkok Suvarnabhumi

Mon 2/9

9:30 pm-12:00 pm

2 stops26h 30m

$929

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Mon 1/26

7:35 am-12:45 am

2 stops29h 10m

Bangkok Suvarnabhumi

Tue 2/3

12:55 am-12:00 pm

2 stops23h 05m

$929

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Mon 2/2

7:35 am-12:45 am

2 stops29h 10m

Bangkok Suvarnabhumi

Sun 2/22

12:55 am-10:33 pm

2 stops33h 38m

$929

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Tue 1/27

7:35 am-12:55 am

2 stops29h 20m

Bangkok Suvarnabhumi

Mon 2/2

12:55 am-12:00 pm

2 stops23h 05m

$929

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Mon 2/2

6:59 am-12:45 am

2 stops29h 46m

Bangkok Suvarnabhumi

Wed 2/18

12:55 am-4:27 pm

2 stops27h 32m

$935

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Mon 2/2

6:59 am-12:55 am

2 stops29h 56m

Bangkok Suvarnabhumi

Wed 2/18

11:15 pm-1:50 pm

2 stops26h 35m

$935

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Thu 1/22

6:00 am-12:55 am

2 stops30h 55m

Bangkok Suvarnabhumi

Mon 2/2

11:15 pm-1:53 pm

2 stops26h 38m

$935

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Tue 2/3

6:59 am-12:45 am

2 stops29h 46m

Bangkok Suvarnabhumi

Wed 2/18

9:30 pm-1:50 pm

2 stops28h 20m

$935

Washington, D.C.Bangkok

DCA - BKK

DCABKK

Washington, D.C. Reagan-National

Thu 2/5

2:00 pm-11:25 am

3 stops33h 25m

Bangkok Suvarnabhumi

Thu 2/19

4:55 pm-9:54 am

3 stops28h 59m

$950

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/4

Showing 1-10 of 60 results
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Best time to book a flight from Reagan-National to Thailand

Have a flexible travel schedule? Discover the best time to fly to Thailand from Reagan-National 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. Reagan-National Airport to Thailand

What is the cheapest month to book a flight from Washington, D.C. Reagan-National Airport to Thailand?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Thailand (average of $860). Flying from Washington, D.C. Reagan-National Airport to Thailand in September is currently the most expensive (average of $1,206). 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 DCA to TH?

Find hourly flight availability from Reagan-National to Thailand. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 6, 2026.

One of the essential ways to save on airfare from Washington, D.C. Reagan-National Airport to Thailand is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 47% on airfare.

What is the cheapest day to fly from Washington, D.C. Reagan-National Airport to Thailand?

Use this chart to determine the cheapest time to fly round-trip from Reagan-National to Thailand. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Washington, D.C. Reagan-National Airport to Thailand flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Thailand

Get insights into the airlines that provide service to Thailand. 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 Thailand. Reviews last updated January 6, 2026.
Read through reviews of airlines operating flights from Washington, D.C. Reagan-National Airport to Thailand, such as Korean Air, Delta, and Cathay Pacific. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,188 reviews

Food

8.1

Entertainment

8.2

Comfort

8.3

Boarding

8.5

Overall

8.4

Crew

8.7

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
1,188 reviews
Korean Air
8.4
Very good
1,188 reviews

Food

8.1

Entertainment

8.2

Comfort

8.3

Boarding

8.5

Overall

8.4

Crew

8.7

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
7.9
Good
8,017 reviews
Korean Air
8.4
Very good
1,188 reviews

Food

8.1

Entertainment

8.2

Comfort

8.3

Boarding

8.5

Overall

8.4

Crew

8.7

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.
Cathay Pacific
7.6
Good
1,121 reviews
Korean Air
8.4
Very good
1,188 reviews

Food

8.1

Entertainment

8.2

Comfort

8.3

Boarding

8.5

Overall

8.4

Crew

8.7

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.
United Airlines
7.4
Good
9,134 reviews
Korean Air
8.4
Very good
1,188 reviews

Food

8.1

Entertainment

8.2

Comfort

8.3

Boarding

8.5

Overall

8.4

Crew

8.7

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.
Air Canada
7.1
Good
10,598 reviews
Korean Air
8.4
Very good
1,188 reviews

Food

8.1

Entertainment

8.2

Comfort

8.3

Boarding

8.5

Overall

8.4

Crew

8.7

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 Reagan-National to Thailand. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Washington, D.C. Reagan-National Airport to Thailand?

    Delta, Korean Air, and China Airlines can get you from Washington, D.C. Reagan-National Airport to Thailand in just under 29h 10m. Your travel time can differ by up to 23h 47m. There are 8797 mi between Washington, D.C. Reagan-National Airport and Thailand. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Washington, D.C. Reagan-National Airport to Thailand?

    The most popular route from Washington, D.C. Reagan-National Airport to Thailand is Washington, D.C. Reagan-National - Bangkok Suvarnabhumi. You may also consider Washington, D.C. Reagan-National - Phuket City or Washington, D.C. Reagan-National - Chiang Mai.

  • Can I find deals for flights from Reagan-National to Thailand that include hotel bookings?

    Yes. In addition to deals on Reagan-National to Thailand flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Reagan-National to Thailand?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Reagan-National to Thailand.

  • Can I find deals for business class flights from Reagan-National to Thailand?

    Yes. Cheapflights offers flight deals from Reagan-National to Thailand 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. Reagan-National Airport to Thailand?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Thailand (average of $860). Flying from Washington, D.C. Reagan-National Airport to Thailand in September is currently the most expensive (average of $1,206). 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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Alternative routes for Reagan-National to Thailand

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Haneda flights
Dulles Intl to Narita flights
Dulles Intl to Suvarnabhumi flights
Reagan-National to Haneda flights
Reagan-National to Narita flights
Baltimore to Haneda flights
Baltimore to Narita flights
Dulles Intl to Incheon Intl flights
Dulles Intl to Hyderabad flights
Baltimore to Suvarnabhumi flights
Reagan-National to Suvarnabhumi flights
Dulles Intl to New Delhi flights
Dulles Intl to Ho Chi Minh City flights
Dulles Intl to Manila flights
Baltimore to Hyderabad flights
Reagan-National to Hyderabad flights
Dulles Intl to Bangalore flights
Reagan-National to Bangalore flights
Dulles Intl to Mumbai flights
Reagan-National to New Delhi flights
Baltimore to Bangalore flights
Dulles Intl to Don Mueang Intl flights
Baltimore to New Delhi flights
Dulles Intl to Taiwan Taoyuan Intl flights
Dulles Intl to Islamabad flights
Baltimore to Incheon Intl flights
Reagan-National to Incheon Intl flights
Reagan-National to Manila flights
Dulles Intl to Hongqiao Intl flights
Dulles Intl to Lahore flights
Dulles Intl to Gimpo Intl flights
Baltimore to Manila flights
Dulles Intl to Ahmedabad flights
Reagan-National to Mumbai flights
Baltimore to Mumbai flights
Dulles Intl to Capital flights
Dulles Intl to Chennai flights
Dulles Intl to Hong Kong flights
Reagan-National to Ho Chi Minh City flights
Dulles Intl to Dhaka flights
Dulles Intl to Pu Dong flights
Reagan-National to Taiwan Taoyuan Intl flights
Reagan-National to Hongqiao Intl flights
Baltimore to Taiwan Taoyuan Intl flights
Reagan-National to Islamabad flights
Baltimore to Ho Chi Minh City flights
Reagan-National to Dhaka flights
Dulles Intl to Colombo flights
Reagan-National to Ahmedabad flights
Dulles Intl to Denpasar flights

Top 5 airlines flying from Reagan-National to Thailand

Discover the top 5 airlines that operate flights from Reagan-National to Thailand. 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 January 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$216Average$1,039FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$857Average$1,008FlexibilityNo cancel feeOn-time81%
DeltaCheapest$977Average$1,085FlexibilityNo cancel feeOn-timeN/A
Cathay PacificCheapest$1,049Average$1,367FlexibilityNo cancel feeOn-time72%
Air CanadaCheapest$1,206Average$1,480FlexibilityNo cancel feeOn-time67%

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