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

Return flights

10 Dec - 26 Dec	Austrian Airlines
08 Dec - 21 Dec	Air France
01 Dec - 08 Dec	Air France
06 Dec - 20 Jan	Air France
01 Dec - 26 Dec	Turkish Airlines
02 Dec - 26 Dec	Turkish Airlines
01 Dec - 05 Dec	Turkish Airlines
31 Dec - 17 Jan	Turkish Airlines
31 Dec - 10 Jan	Lufthansa
24 Dec - 24 Jan	Air France
29 Dec - 09 Jan	Air France
17 Dec - 28 Dec	Lufthansa
18 Dec - 01 Jan	Qatar Airways
18 Dec - 18 Jan	Turkish Airlines
18 Dec - 12 Jan	Qatar Airways
26 Dec - 15 Jan	Air France
22 Dec - 11 Jan	Air France

Also check the deals for one-way flights from Bucharest 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 Bucharest to Bangkok in December from $760

Return flights