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

Return flights

07 Dec - 17 Dec	ANA
31 Dec - 19 Jan	China Airlines
05 Dec - 15 Dec	ANA
09 Dec - 16 Dec	Air Canada
06 Dec - 16 Dec	Hawaiian Airlines
28 Dec - 30 Jan	China Airlines
07 Dec - 14 Dec	Alaska Airlines
29 Dec - 20 Jan	Alaska Airlines
08 Dec - 18 Dec	Cathay Pacific
29 Dec - 17 Jan	Alaska Airlines
07 Dec - 17 Dec	Philippine Airlines	direct
11 Dec - 23 Dec	Japan Airlines
10 Dec - 23 Dec	Alaska Airlines
09 Dec - 19 Dec	Japan Airlines
30 Dec - 09 Jan	Hainan Airlines
15 Dec - 15 Jan	Hawaiian Airlines
26 Dec - 10 Jan	Cathay Pacific
06 Dec - 06 Jan	Cathay Pacific
18 Dec - 20 Jan	Air Canada
26 Dec - 08 Jan	Hawaiian Airlines

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 $921

Return flights