AirHint found the following cheapest return flights from Bangkok (BKK) to Zurich (ZRH) in September 2025 (see full year).

Return flights

15 Sep - 22 Sep	IndiGo
25 Sep - 05 Oct	Oman Air
19 Sep - 22 Sep	IndiGo
26 Sep - 12 Oct	Air India
19 Sep - 21 Sep	Air India
11 Sep - 24 Sep	Air India
24 Sep - 08 Oct	Air India
14 Sep - 28 Sep	Air India
18 Sep - 01 Oct	Air India
18 Sep - 24 Sep	Air India
14 Sep - 24 Sep	Air India
11 Sep - 15 Sep	Air India
11 Sep - 14 Sep	Air India
07 Sep - 14 Sep	Air India
25 Sep - 12 Oct	Air India
27 Sep - 12 Oct	Air India
30 Sep - 16 Oct	Etihad Airways
15 Sep - 28 Oct	IndiGo
30 Sep - 23 Oct	IndiGo
30 Sep - 11 Oct	IndiGo

Also check the deals for one-way flights from Bangkok to Zurich 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 return flights from Bangkok to Zurich in September from 556€

Return flights