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

Return flights

02 Dec - 16 Dec	Korean Air
02 Dec - 15 Dec	Korean Air
02 Dec - 08 Dec	Korean Air
02 Dec - 11 Dec	Korean Air
02 Dec - 09 Dec	Korean Air
02 Dec - 12 Dec	Korean Air
01 Dec - 09 Dec	Delta
01 Dec - 15 Dec	Delta
01 Dec - 11 Dec	Delta
01 Dec - 16 Dec	Delta
31 Dec - 14 Jan	Spirit Airlines
01 Dec - 15 Jan	Korean Air
09 Dec - 21 Jan	Turkish Airlines
30 Dec - 14 Jan	Turkish Airlines
28 Dec - 15 Jan	Delta
28 Dec - 14 Jan	Korean Air
28 Dec - 13 Jan	Alaska Airlines
11 Dec - 18 Jan	Spirit Airlines
11 Dec - 15 Jan	Spirit Airlines
31 Dec - 10 Jan	Frontier Airlines

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

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 December from 710€

Return flights