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

Return flights

31 Dec - 10 Jan	Frontier Airlines
28 Dec - 14 Jan	EVA Air
28 Dec - 18 Jan	EVA Air
28 Dec - 15 Jan	Frontier Airlines
25 Dec - 20 Jan	Frontier Airlines
27 Dec - 12 Jan	EVA Air
28 Dec - 12 Jan	EVA Air
26 Dec - 17 Jan	Frontier Airlines
25 Dec - 18 Jan	EVA Air
28 Dec - 09 Jan	EVA Air
21 Dec - 28 Dec	Air Canada
26 Dec - 28 Dec	EVA Air
17 Dec - 29 Dec	Royal Jordanian
23 Dec - 30 Dec	Aer Lingus

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 $1302

Return flights