Bangkok is a popular destination among Singaporeans and so, flying to Bangkok is easy due to the wide array of choices available. The best is to take the first flight out and last flight back. This way, the time in Bangkok is being maximised.
Do you know that sometimes you can get cheaper prices by doing Mix & Match? This is especially true for Budget Airlines as their prices varies. What do I mean by Mix & Match. E.g. Fly to Bangkok by Jetstar and Return to Singapore by Scoot.
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In Bangkok, there are 2 airports. Survarnabhumi is the International Airport and it connects to other parts of the world via major full service carriers. Don Mueang is the Domestic Airport and it houses budget carriers such as Air Asia and Scoot and it is convenient for passengers who intends to transit to other parts of Thailand.