Booking with Thai AirAsia 3 days in advance of your planned departure date is, on average, the best time to get cheap flights from Bangkok Don Mueang Intl Airport to Chiang Mai. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
For Economy class flights the cheapest month to fly the route is May. The most expensive months are December and January.
In terms of precipitation, rainfall in Chiang Mai ranges from 0.0 - 250.0 inches per month. September is typically the wettest month, when rainfall can reach 250.0 mm. January is typically the driest time to visit Chiang Mai when rainfall is around 0.0 mm.
If weather is an important factor for your trip to Chiang Mai, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 29.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.0 C).
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