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

Return flights

08 Oct - 29 Oct	Cathay Pacific
21 Oct - 28 Oct	Cathay Pacific
05 Oct - 21 Oct	United
02 Oct - 09 Oct	Cathay Pacific
26 Oct - 16 Nov	Cathay Pacific
31 Oct - 15 Nov	Air India
13 Oct - 20 Oct	ANA
11 Oct - 16 Oct	Cathay Pacific
11 Oct - 25 Oct	Cathay Pacific
14 Oct - 19 Oct	Cathay Pacific
12 Oct - 14 Nov	IndiGo
10 Oct - 18 Oct	United

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 612€

Return flights