Rare1 stop · 10.5h
WAS to LIMPeru
Lima
$347
usually $630
−45%
Most monthly lows $409–$630. Cheaper than every other month on record (3).
Flights · WAS → BKK
Washington to Bangkok
Best fare, round trip
$514
−43%
below its usual $900
you keep $386
RareFound
- Depart
- Wed 13 Jan
- Return
- Mon 1 Feb
- Stay
- 19 nights
- Flight
- 2 stops · 23.5h
- Airline
Korean Air
Most of this route’s monthly lows fall between $625 and $956. The drop beats 91% of measured fares on the board, over 5 observed months.
Cached fare — the booking search re-prices live before you pay.
ThailandBangkokThe backpacker cliché that still delivers: gold temples, boat noodles, $12 street-food feasts.Best windowNov–FebAirportsSuvarnabhumi (BKK) · Don Mueang (DMK)Every route into BangkokFare seasonality
When this route gets cheap.
Fares bottom out in January around $514 and peak in December near $1,584, 208% dearer, across the 5 months we track. The cheapest itinerary we are tracking makes 2 stops and takes about 23.5 hours outbound, on a 19-night trip — ticketed under Korean Air, which on a connecting fare need not operate every leg. At $514 for 14,155 km each way, that works out to about $18 per 1,000 km flown. That is well under the $42 per 1,000 km that ultra-long-haul fares on this board typically run. Across the 13 departure cities we track at a similar distance from Bangkok, this fare ranks 3rd — 15% above the $448 from New York. It is also the cheapest of the 27 routes of similar length we watch out of Washington. The best time to be in Bangkok: Nov–Feb.
The 6 days we hold a cached fare for
Press a date to compare its fares
The median cached fare across this calendar is 30% lower than when tracking began on 8 Aug — $1,122 then versus $791 now, across 22 recorded snapshots. This is a calendar-level trend, so an individual deal above can be lower. The lowest single day we have seen here is $482, on 13 Jan '27.
These are the only days we have a cached price for on this route so far — not the only days it flies. The search above covers any date.
Cached fares · checked 17 Oct 2026
Cheapest in Jan, around $514
43% below the $900 typical fare
$625Oct, below the usual price. Compare October fares.$956Nov, above the usual price. Compare November fares.$1584Dec, above the usual price. Compare December fares.$514Jan ’27, the cheapest month. Compare January fares.$900Mar, around the usual price. Compare March fares.
CheapestBelow usualUsualAbove usualPress a month to compare its fares
Cheapest round-trip fare found each month, Washington to Bangkok, from cached prices.
Route facts
- Airports
- Dulles (IAD) · Reagan National (DCA) · Baltimore (BWI) ↔ Suvarnabhumi (BKK) · Don Mueang (DMK)
- Flight time
- ≈23.5 hours outbound
- Distance
- ≈14,155 km each way
- Typical price
- $900 round-trip (seasonal median)
- Airlines on the board
- Korean Air
- Itineraries
- Connections on current fares
- Best months to visit
- Nov–Feb
Good to know
WAS → BKK, answered.
Is $514 a good price for Washington to Bangkok?
Yes — the seasonal median for this route is around $900 round-trip. At $514 you're 43% below that, which we rate rare for this route.
What is the cheapest month to fly from Washington to Bangkok?
Across 5 months of cached-fare history, Jan comes out cheapest on this route. The best months to actually be in Bangkok are Nov–Feb — when those overlap, that's your window.
How far in advance should I book WAS → Bangkok?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. What we can measure is which month is cheap: across 5 months of cached fares, Jan comes out lowest on this route. Our guide Why flight prices change covers what does move a fare.
Are there nonstop flights from Washington to Bangkok?
The current cheapest fares involve a connection, ticketed under Korean Air. We hold no nonstop fare on this route right now, which does not mean none flies — search your exact dates to see what does.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on 17 October). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Bangkok?
Lock the flight first — then compare stays for 13 Jan '27 – 1 Feb '27 · 19 nights.
Browse hotelsMissed it?
Cached fares expire. This route has a feed of its own — follow it and the next WAS → BKK drop reaches you as soon as we find it.
Follow this route’s feedKeep browsing
Related routes on the board.
Rare1 stop · 5h
WAS to HOUUnited States
Houston
$188
usually $320
−41%
Most monthly lows $275–$320. Cheaper than every other month on record (3).
Great1 stop · 18h
WAS to PEKChina
Beijing
$686
usually $1,040
−34%
Most monthly lows $939–$1,040. Cheaper than every other month on record (3).
Exceptional1 stop · 17.5h
BOS to BKKUnited States
Boston
$506
usually $1,140
−56%
Most monthly lows $915–$1,187. Cheaper than every other month on record (5).
- Travel dates
- 7 Mar '27 – 17 Apr '27 · 41 nights
- Airline
Turkish Airlines· $18 per 1,000 km
Rare1 stop · 20.5h
NYC to BKKUnited States
New York
$448
usually $755
−41%
Most monthly lows $726–$795. Cheaper than every other month on record (6).
Great2 stops · 11h
DXB to BKKUAE
Dubai
$300
usually $445
−33%
Most monthly lows $438–$449. Cheaper than every other month on record (8).
