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We’ve been to Thailand 4 times and have flown Bangkok Airways for domestic for several flights during those trips.
Great airline and honestly we’ve never had any cancellation issues.
Some minor delays are all.
Also, as I understand it, their flights actually get more expensive the closer you get to the trip date, so booking in advance is typically the best rate.
We haven’t had to deal with rescheduling so I can’t help you there.
They tend to be more expensive than AirAsia and a couple other budget airlines, but I think their baggage allowance is slightly better.
We just used them this month and had another good experience.