Cheap flights from Washington to Bangkok from $695 DCA, IAD → BKK, DMK
Ronald Reagan National Airport (DCA), Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK), Don Mueang International Airport (DMK)
The cheapest return found recently is $849 with Etihad Airways, 21 Jan 2027 – 10 Feb 2027, found 2 days ago. The cheapest one-way found recently is $695 with American Airlines, 14 Jul 2027, found 6 days ago.
- Cheapest one-way found recently
- $695, found 6 days ago
- Cheapest return found recently
- $849, 21 Jan 2027 to 10 Feb 2027
- Usual return price
- $948 to $1,037
- Cheapest month to fly
- January 2027, return fares from $849 found in the last 7 days
Return
The cheapest return fare on each of 8 departure dates is usually $948 to $1,037.
Cheapest return found recently
$849
21 Jan 2027 – 10 Feb 2027 · Etihad Airways
Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK)
Leaves 2:25 p.m. · Return leaves 2:40 p.m. · 51 h 35 min of travel, both ways together
out 1 stop, back 1 stop · via Abu Dhabi International Airport (AUH) · overnight connection · 8 h connection
found 2 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$849 21 Jan 2027 – 10 Feb 2027found 2 days agoSee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 49 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $522 to $880.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 8 departure dates from 22 Nov to 22 Jan 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 20-night return fares leaving within 3 days of 21 Jan 2027 to compare.
Every date we hold
164 fares on 8 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 22 Nov – 4 Dec | $977 | Etihad Airways | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 29 Nov – 20 Dec | $1,021 | Etihad Airways | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 8 Dec – 22 Dec | $1,085 | Turkish Airlines | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found 7 days ago | See prices for these dates |
| 21 Dec – 27 Dec | $1,968 | Frontier Airlines | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 3 stops, back 1 stop | found 2 days ago | See prices for these dates |
| 7 Jan 2027 – 21 Jan 2027 | $890 | Qatar Airways | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 16 Jan 2027 – 1 Feb 2027 | $972 | Etihad Airways | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found 8 days ago | See prices for these dates |
| 21 Jan 2027 – 10 Feb 2027 | $849 | Etihad Airways | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 22 Jan 2027 – 29 Jan 2027 | $967 | Air Premia | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found 8 days ago | See prices for these dates |
Which month looks cheapest?
January 2027 is the cheapest month — from $849.
Airlines on the cheapest dates: Etihad Airways, Turkish Airlines, Frontier Airlines, Qatar Airways, Air Premia.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$695
14 Jul 2027 · American Airlines
Ronald Reagan National Airport (DCA) → Suvarnabhumi Airport (BKK)
Leaves 8:20 a.m. · 27 h 40 min trip
2 stops
found 6 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$695 14 Jul 2027found 6 days agoOpen this trip
$647 14 Jul 2027found 7 days agoOpen this trip
What have prices looked like?
Over 28 days, 4 Oct to 11 Nov, the cheapest one-way we saw each day was $312 to $695.
At $695, the cheapest one-way found recently is at the high end of that range.
28 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Not enough comparable prices yet: we hold one-way fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 14 Jul 2027 to compare.
Every date we hold
4 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 14 Jul 2027 | $647 | Korean Air | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | 1 stop | found 7 days ago | Open this trip |
Airlines on the cheapest dates: Korean Air.
Premium cabin fares from Washington to Bangkok
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 21 Jan 2027 – 10 Feb 2027 in another cabin: Premium economy · Business · First
Today's prices for 14 Jul 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Washington to Bangkok?
Return
Fares 90 to 179 days before departure were typically 20% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (49 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $1,069 | $780 | +25% | 20 |
| 7–13 days | $1,102 | $776 | +29% | 28 |
| 14–29 days | $1,021 | $764 | +20% | 29 |
| 30–59 days | $955 | $764 | +12% | 46 |
| 60–89 days | $903 | $553 | +6% | 47 |
| 90–179 days | $853 | $522 | Cheapest seen | 44 |
| 180+ days | $1,057 | $523 | +24% | 32 |
One-way
Not enough history yet: in 28 days of one-way prices, 4 Oct to 11 Nov, fewer than 3 booking ranges had prices on 7 days or more.
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Baltimore → Bangkok
57 km from Washington
$1,345
$496 more than flying from Washington
21 Jan 2027 – 10 Feb 2027 · BWI → BKK · out 3 stops, back 3 stops
found 2 days ago
Harrisburg → Bangkok
148 km from Washington
$1,439
$590 more than flying from Washington
16 Nov – 27 Nov · MDT → BKK · out 2 stops, back 2 stops
found 4 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Baltimore → Bangkok
57 km from Washington
$781
$86 more than flying from Washington
14 Jul 2027 · BWI → BKK · 2 stops
found 6 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 21 Jan 2027 – 10 Feb 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Washington to Bangkok?
The cheapest return found recently is $849 with Etihad Airways, 21 Jan 2027 to 10 Feb 2027, found 2 days ago. The cheapest return fare on each of 8 departure dates is usually $948 to $1,037.
How much is a one-way flight from Washington to Bangkok?
The cheapest one-way found recently is $695 with American Airlines, 14 Jul 2027, found 6 days ago. The cheapest one-way we hold, of any age, is $647 with Korean Air, 14 Jul 2027, found 7 days ago.
What is the cheapest month to fly from Washington to Bangkok?
January 2027 is the cheapest month for a return, from $849, 21 Jan 2027 to 10 Feb 2027, found 2 days ago.
How far ahead should I book a flight from Washington to Bangkok?
In 49 days of prices between 24 Sept and 11 Nov, return fares 90 to 179 days before departure were typically 20% lower than 0 to 6 days before departure.
How long is the flight from Washington to Bangkok?
The cheapest one-way found recently, with American Airlines on 14 Jul 2027, takes 27 h 40 min with 2 stops.
Which airlines have the cheapest flights from Washington to Bangkok?
Between 22 Nov and 22 Jan 2027, Etihad Airways has the cheapest return on 4 of the 8 departure dates we hold, Turkish Airlines on 1 and Frontier Airlines on 1.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work