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

Return flights

09 Dec - 24 Dec	Singapore Airlines
04 Dec - 16 Dec	Philippine Airlines
28 Dec - 16 Jan	Singapore Airlines
26 Dec - 16 Jan	Singapore Airlines
04 Dec - 27 Dec	Korean Air
02 Dec - 09 Jan	Philippine Airlines
04 Dec - 16 Dec	Philippine Airlines	direct
03 Dec - 29 Dec	Korean Air
23 Dec - 22 Jan	ANA
02 Dec - 10 Jan	Singapore Airlines
12 Dec - 19 Dec	Korean Air
23 Dec - 19 Jan	ANA
24 Dec - 20 Jan	ANA
11 Dec - 18 Dec	Korean Air
02 Dec - 11 Jan	Alaska Airlines
29 Dec - 17 Jan	ANA
02 Dec - 06 Jan	Philippine Airlines
14 Dec - 21 Dec	Alaska Airlines
12 Dec - 30 Dec	Alaska Airlines
15 Dec - 22 Dec	China 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 $738

Return flights