AirHint found the following cheapest return flights from Chicago (ORD) to Bangkok (BKK) in October 2025 (see full year).

Return flights

07 Oct - 21 Oct	United
20 Oct - 28 Oct	United
01 Oct - 08 Oct	United
01 Oct - 09 Oct	United
21 Oct - 04 Nov	ANA
15 Oct - 22 Oct	Cathay Pacific
16 Oct - 26 Oct	Cathay Pacific
15 Oct - 26 Oct	Cathay Pacific
30 Oct - 06 Nov	Korean Air
29 Oct - 05 Nov	ANA
16 Oct - 23 Oct	Korean Air
28 Oct - 18 Nov	Cathay Pacific
01 Oct - 19 Oct	Cathay Pacific
10 Oct - 04 Nov	ANA
14 Oct - 17 Oct	ANA
21 Oct - 03 Nov	United
21 Oct - 07 Nov	United
08 Oct - 05 Nov	United
22 Oct - 20 Nov	Delta

Also check the deals for one-way flights from Chicago to Bangkok in October.

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 Chicago to Bangkok in October from 596€

Return flights