Washington to Bangkok 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 $891 with Korean Air, 13 Jan 2027 – 1 Feb 2027, found yesterday.
Return
The cheapest return fare on each of 6 departure dates is usually $885 to $1,476.
Cheapest return found recently
$891
13 Jan 2027 – 1 Feb 2027 · Korean Air
Ronald Reagan National Airport (DCA) → Suvarnabhumi Airport (BKK)
Leaves 6:05 a.m. · Return leaves 9:40 p.m. · 62 h 40 min of travel, both ways together
out 2 stops, back 2 stops
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$891 13 Jan 2027 – 1 Feb 2027found yesterdaySee prices for these dates
$574 16 Mar 2027 – 28 Mar 2027found 4 days agoSee prices for these dates
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $522 to $880.
At $891, the cheapest return found recently is above that range.
25 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 return price?
Compared with the cheapest return fare on each of 6 departure dates from 29 Oct to 16 Mar 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 19-night return fares leaving within 3 days of 13 Jan 2027 to compare.
Every date we hold
21 fares on 6 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 29 Oct – 25 Nov | $1,152 | United Airlines | Ronald Reagan National Airport (DCA) → Suvarnabhumi Airport (BKK) | out 2 stops, back 2 stops | found 5 days ago | See prices for these dates |
| 13 Dec – 4 Jan 2027 | $1,584 | Aer Lingus | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 3 stops, back 2 stops | found 4 days ago | See prices for these dates |
| 21 Dec – 6 Jan 2027 | $2,066 | Frontier Airlines | Ronald Reagan National Airport (DCA) → Suvarnabhumi Airport (BKK) | out 3 stops, back 2 stops | found 6 days ago | See prices for these dates |
| 13 Jan 2027 – 28 Jan 2027 | $880 | Korean Air | Ronald Reagan National Airport (DCA) → Suvarnabhumi Airport (BKK) | out 2 stops, back 2 stops | found 3 days ago | See prices for these dates |
| 17 Jan 2027 – 5 Feb 2027 | $900 | Turkish Airlines | Washington Dulles International Airport (IAD) → Suvarnabhumi Airport (BKK) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
| 16 Mar 2027 – 28 Mar 2027 | $574 | Korean Air | Ronald Reagan National Airport (DCA) → Suvarnabhumi Airport (BKK) | out 2 stops, back 2 stops | found 4 days ago | See prices for these dates |
Which month looks cheapest?
March 2027 is the cheapest month — from $574.
Airlines on the cheapest dates: Korean Air, United Airlines, Aer Lingus, Frontier Airlines, Turkish Airlines.
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 13 Jan 2027 – 1 Feb 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Washington to Bangkok?
Return
Fares 180 or more days before departure were typically 47% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (25 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 | $1,022 | $780 | +89% | 12 |
| 7–13 days | $1,012 | $776 | +87% | 14 |
| 30–59 days | $873 | $764 | +61% | 23 |
| 60–89 days | $943 | $553 | +74% | 23 |
| 90–179 days | $553 | $522 | +2% | 25 |
| 180+ days | $541 | $523 | Cheapest seen | 15 |
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
$1,238
$347 more than flying from Washington
17 Jan 2027 – 25 Jan 2027 · BWI → BKK · out 2 stops, back 2 stops
found yesterday
Harrisburg → Bangkok
148 km from Washington
$1,428
$537 more than flying from Washington
16 Nov – 27 Nov · MDT → BKK · out 2 stops, back 2 stops
found 6 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 13 Jan 2027 – 1 Feb 2027. A live search on this page shows what those dates cost now, for one adult in economy.
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