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

Return flights

30 Dec - 19 Jan	Korean Air
31 Dec - 20 Jan	Korean Air
02 Dec - 11 Dec	Singapore Airlines
02 Dec - 11 Dec	Philippine Airlines	direct
26 Dec - 30 Jan	Singapore Airlines
04 Dec - 27 Dec	Korean Air
09 Dec - 25 Dec	Korean Air
31 Dec - 20 Jan	Philippine Airlines	direct
23 Dec - 13 Jan	ANA
27 Dec - 27 Jan	EVA Air
09 Dec - 25 Dec	Philippine Airlines	direct
26 Dec - 27 Jan	Singapore Airlines
29 Dec - 17 Jan	China Airlines
26 Dec - 27 Dec	China Airlines
25 Dec - 13 Jan	ANA
04 Dec - 11 Dec	Air Canada
26 Dec - 30 Jan	Philippine Airlines	direct
18 Dec - 25 Dec	Alaska Airlines
13 Dec - 29 Dec	EVA Air
14 Dec - 30 Dec	EVA Air

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 736€

Return flights