Cheapest return flights from Portland to Bangkok in December from $912

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

Return flights

08 Dec - 15 Dec Frontier Airlines
29 Dec - 12 Jan China Airlines
28 Dec - 12 Jan China Airlines
27 Dec - 12 Jan China Airlines
30 Dec - 10 Jan Frontier Airlines
29 Dec - 10 Jan Hawaiian Airlines
26 Dec - 12 Jan EVA Air
12 Dec - 10 Jan Air Canada
25 Dec - 01 Jan Air Canada
21 Dec - 31 Dec Hawaiian Airlines
12 Dec - 03 Jan Alaska Airlines
18 Dec - 03 Jan Hawaiian Airlines

Also check the deals for one-way flights from Portland to Bangkok in December.

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