Cheapest return flights from Chiang Mai to London in September from 735€

Best time to book flights for Chiang Mai (CNX) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Chiang Mai (CNX) to London (LHR) in September 2025 (see full year).

Return flights

23 Sep - 03 Oct Thai AirAsia
18 Sep - 25 Sep Thai AirAsia

Also check the deals for one-way flights from Chiang Mai to London in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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