In general, when booking your flight to Krabi, September is the cheapest month on average.
On average, from most locations, when planning your trip to Krabi, try to book your flight in the region of 60 days in advance for the cheapest prices.
From most locations, the cheapest flights to Krabi are found on a Wednesday. Booking a Saturday departure is usually the most expensive.
On average you can find the best deals on plane tickets to Krabi when looking for flights with morning departure times.