AirHint found the following cheapest one-way flights from Bangkok (BKK) to Kolkata (CCU) in September 2025 (see full year).

One-Way flights

02 Sep	Thai Lion Air	direct
04 Sep	Thai Lion Air	direct
08 Sep	Thai Lion Air	direct
27 Sep	Thai Lion Air	direct
06 Sep	Thai Lion Air	direct
23 Sep	Thai Lion Air	direct
21 Sep	Thai AirAsia	direct
17 Sep	Thai AirAsia	direct
12 Sep	IndiGo	direct
18 Sep	IndiGo	direct

Also check the deals for return flights from Bangkok to Kolkata in September.

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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Cheapest one-way flights from Bangkok to Kolkata in September from 61€

One-Way flights