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

Return flights

30 Dec - 14 Jan	ANA
07 Dec - 20 Dec	Delta
08 Dec - 21 Dec	ANA
28 Dec - 20 Jan	Delta
27 Dec - 17 Jan	Delta
28 Dec - 12 Jan	Delta
25 Dec - 08 Jan	Delta
24 Dec - 08 Jan	Delta
24 Dec - 18 Jan	Delta
25 Dec - 06 Jan	Delta
14 Dec - 21 Dec	Air India
23 Dec - 27 Dec	Air India
15 Dec - 23 Dec	Air India
22 Dec - 19 Jan	Delta
24 Dec - 31 Dec	Air India
30 Dec - 05 Jan	ANA
21 Dec - 31 Dec	United

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 794€

Return flights