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

Return flights

02 Dec - 12 Dec	Frontier Airlines
05 Dec - 17 Dec	Frontier Airlines
08 Dec - 19 Dec	Frontier Airlines
03 Dec - 07 Dec	Frontier Airlines
31 Dec - 14 Jan	Frontier Airlines
02 Dec - 11 Dec	Delta
09 Dec - 07 Jan	Frontier Airlines
30 Dec - 05 Jan	Frontier Airlines
15 Dec - 29 Dec	Frontier Airlines
23 Dec - 30 Dec	Frontier Airlines
22 Dec - 01 Jan	Hawaiian Airlines
30 Dec - 04 Jan	Frontier Airlines
24 Dec - 01 Jan	Hawaiian Airlines
31 Dec - 04 Jan	Frontier Airlines
16 Dec - 08 Jan	Air Canada
11 Dec - 03 Jan	WestJet

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 710€

Return flights