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

Return flights

24 Dec - 18 Jan	Frontier Airlines
07 Dec - 11 Dec	Delta
05 Dec - 27 Dec	Delta
11 Dec - 21 Dec	Frontier Airlines
24 Dec - 15 Jan	Frontier Airlines
26 Dec - 17 Jan	Delta
25 Dec - 01 Jan	Delta
03 Dec - 23 Dec	Frontier Airlines
24 Dec - 31 Dec	Frontier Airlines
13 Dec - 28 Dec	Frontier Airlines
20 Dec - 30 Dec	Porter Airlines (Canada) Ltd
16 Dec - 23 Dec	Frontier Airlines
29 Dec - 06 Jan	Delta
19 Dec - 11 Jan	Porter Airlines (Canada) Ltd
27 Dec - 05 Jan	Delta
27 Dec - 06 Jan	Delta
27 Dec - 10 Jan	Delta
28 Dec - 09 Jan	Delta
15 Dec - 23 Dec	Delta
15 Dec - 22 Dec	Delta

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 $1566

Return flights