Route brief · BKK → WAS
Bangkok → Washington
$855
round-trip · too little price history on this route to compare
Sep 11 – Sep 26 · 15 nights
Thai Airways1 stop
Cached fare — the booking search re-prices live before you pay.
Destination briefWASWashingtonFree museums by the dozen, and three airports competing hard enough to keep transatlantic fares honest.Best windowApr–May · Sep–OctAirportsDulles (IAD) · Reagan National (DCA) · Baltimore (BWI)All routes into WashingtonWhen this route gets cheap.
Best time to be in Washington: Apr–May · Sep–Oct. Fare history for this route is still thin, so we make no seasonal call yet.
The cheapest itinerary we are tracking makes one stop and takes about 18.5 hours outbound, on a 15-night trip — ticketed under Thai Airways, which on a connecting fare need not operate every leg. At $855 for 14,155 km each way, that works out to about $30 per 1,000 km flown. That is below the $40 typical of ultra-long-haul fares here. Across the 11 departure cities we track at a similar distance from Washington, this fare ranks 3rd — 21% above the $709 from Dubai. That puts it in the cheaper half of the 18 routes of similar length we watch out of Bangkok, where the middle fare is $1,209. We have 1 month of cached prices for this route so far — not enough to call a fare cheap or expensive, so we publish the price without a percentage.
The 2 days we hold a cached fare for
Tap a date → live search
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.
Route facts
- Airports
- Suvarnabhumi (BKK) · Don Mueang (DMK) ↔ Dulles (IAD) · Reagan National (DCA) · Baltimore (BWI)
- Flight time
- ~18.5 hours outbound
- Distance
- ~14,155 km each way
- Airlines on the board
- Thai Airways
- Itineraries
- Connections on current fares
- Best months to visit
- Apr–May · Sep–Oct
BKK → WAS, answered.
How far in advance should I book BKK → Washington?
We do not publish a number for this, because we cannot measure it yet.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. See /guides/what-moves-a-flight-price/ for the levers we can measure.
Are there nonstop flights from Bangkok to Washington?
The current cheapest fares involve a connection, ticketed under Thai Airways. Nonstop options exist on many dates at higher prices — check the live search for your exact dates.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on September 1). 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 Washington?
Lock the flight first — then compare stays for Sep 11 – Sep 26 · 15 nights.
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Missed it?
Cached fares expire. This route has a feed of its own — follow it and the next BKK → WAS drop reaches you as soon as we find it.
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