Cheapest return flights from Seattle to Singapore in December from $1049

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

Return flights

15 Dec - 24 Dec Korean Air
13 Dec - 26 Dec STARLUX Airlines
23 Dec - 06 Jan Philippine Airlines
22 Dec - 05 Jan Asiana Airlines
26 Dec - 03 Jan Asiana Airlines
13 Dec - 26 Dec Singapore Airlines direct
19 Dec - 04 Jan Philippine Airlines
26 Dec - 03 Jan Singapore Airlines direct
23 Dec - 06 Jan Singapore Airlines direct

Also check the deals for one-way flights from Seattle to Singapore in December.

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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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