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

Return flights

02 Dec - 10 Dec	Spirit Airlines
02 Dec - 15 Dec	Spirit Airlines
01 Dec - 16 Dec	Frontier Airlines
01 Dec - 09 Dec	Delta
03 Dec - 16 Dec	Delta
03 Dec - 09 Dec	Delta
03 Dec - 29 Jan	Delta
01 Dec - 15 Jan	Delta
09 Dec - 16 Dec	Spirit Airlines
08 Dec - 23 Dec	Spirit Airlines
09 Dec - 23 Dec	Spirit Airlines
09 Dec - 22 Dec	Spirit Airlines
30 Dec - 19 Jan	Spirit Airlines
28 Dec - 14 Jan	Frontier Airlines
29 Dec - 12 Jan	Spirit Airlines
28 Dec - 15 Jan	Frontier Airlines
10 Dec - 08 Jan	Spirit Airlines
15 Dec - 12 Jan	Frontier Airlines
27 Dec - 11 Jan	Spirit Airlines
25 Dec - 18 Jan	Alaska 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 696€

Return flights