At the moment, there are ten airlines flying to Bangkok. Go through the results to find the right flights for you – you can adjust the filters to see find even more flights to Bangkok.
The most popular airlines offering flights to Bangkok are Etihad Airways, Lufthansa & SWISS. Etihad Airways is the most popular one, but that doesn’t mean their flights will be the cheapest. If you can't find a flight time that suits you, why not look at flying out from a different airport?
The distance between Washington DC Washington Dulles International Airport to Bangkok is 14172 km. Normally, it takes about 28 hrs 25 mins to fly, and you can definitely expect the journey to be at least 21 hrs 15 mins. You can see the various flight times in the results.
Searching by month, for instance, will show you the best time of the week to fly.