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

Return flights

04 Dec - 09 Dec	Frontier Airlines
02 Dec - 12 Dec	Frontier Airlines
04 Dec - 11 Dec	Frontier Airlines
05 Dec - 12 Dec	ANA
07 Dec - 12 Dec	Korean Air
31 Dec - 14 Jan	Frontier Airlines
05 Dec - 17 Dec	Korean Air
02 Dec - 10 Dec	Korean Air
11 Dec - 20 Dec	Alaska Airlines
15 Dec - 29 Dec	Frontier Airlines
13 Dec - 21 Jan	Frontier Airlines
12 Dec - 06 Jan	China Airlines
25 Dec - 01 Jan	WestJet
22 Dec - 01 Jan	Alaska Airlines
11 Dec - 03 Jan	Alaska Airlines
22 Dec - 02 Jan	Hawaiian Airlines
01 Dec - 10 Dec	Finnair

Also check the deals for one-way flights from Phoenix 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 Phoenix to Bangkok in December from $750

Return flights