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

Return flights

02 Oct - 05 Oct	Cathay Pacific
21 Oct - 28 Oct	Cathay Pacific
28 Oct - 11 Nov	Cathay Pacific
23 Oct - 09 Nov	Cathay Pacific
21 Oct - 19 Nov	Cathay Pacific
28 Oct - 04 Nov	Cathay Pacific
21 Oct - 30 Oct	Cathay Pacific
21 Oct - 08 Nov	Cathay Pacific
23 Oct - 01 Nov	Cathay Pacific
20 Oct - 28 Oct	Delta
06 Oct - 20 Oct	Delta
07 Oct - 21 Oct	Delta
16 Oct - 30 Oct	Delta
08 Oct - 15 Oct	Delta
20 Oct - 04 Nov	Delta
22 Oct - 20 Nov	Cathay Pacific
07 Oct - 14 Oct	Delta
05 Oct - 21 Oct	Delta
18 Oct - 02 Nov	Delta
17 Oct - 11 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 $689

Return flights