AirHint found the following cheapest return flights from Seattle (SEA) to Manila (MNL) in December 2026 (see full year).

Return flights

11 Dec - 27 Dec	Asiana Airlines
12 Dec - 28 Dec	Asiana Airlines
24 Dec - 16 Jan	ANA
17 Dec - 15 Jan	ANA
17 Dec - 14 Jan	ANA
16 Dec - 30 Dec	Cathay Pacific
17 Dec - 05 Jan	ANA
05 Dec - 03 Jan	Asiana Airlines
18 Dec - 06 Jan	Asiana Airlines
20 Dec - 10 Jan	Singapore Airlines
16 Dec - 05 Jan	ANA
16 Dec - 06 Jan	ANA
17 Dec - 06 Jan	ANA
11 Dec - 27 Dec	Philippine Airlines	direct
16 Dec - 30 Dec	Philippine Airlines	direct

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 $865

Return flights