AirHint found the following cheapest return flights from Seattle (SEA) to Manila (MNL) in December 2025 (see full year).

Return flights

02 Dec - 11 Jan	Asiana Airlines
09 Dec - 12 Jan	Asiana Airlines
29 Dec - 12 Jan	Asiana Airlines
28 Dec - 12 Jan	Asiana Airlines
26 Dec - 27 Jan	Asiana Airlines
26 Dec - 27 Jan	Philippine Airlines	direct
12 Dec - 29 Dec	Asiana Airlines
11 Dec - 28 Dec	ANA
26 Dec - 09 Jan	Asiana Airlines
16 Dec - 29 Dec	Asiana Airlines
29 Dec - 17 Jan	United
19 Dec - 21 Jan	Harbour Air
02 Dec - 11 Jan	Philippine Airlines	direct
17 Dec - 30 Dec	China Airlines
17 Dec - 30 Dec	Philippine Airlines	direct
15 Dec - 28 Dec	United

Also check the deals for one-way flights from Seattle to Manila 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 Seattle to Manila in December from 709€

Return flights