Cheapest return flights from Seattle to Singapore in December from 651€

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

Return flights

08 Dec - 15 Dec Asiana Airlines
26 Dec - 14 Jan Singapore Airlines
27 Dec - 15 Jan Singapore Airlines direct
23 Dec - 30 Dec Philippine Airlines
12 Dec - 03 Jan STARLUX Airlines
20 Dec - 27 Dec STARLUX Airlines
23 Dec - 03 Jan Philippine Airlines
20 Dec - 06 Jan STARLUX Airlines
16 Dec - 04 Jan STARLUX Airlines
20 Dec - 01 Jan STARLUX Airlines
24 Dec - 04 Jan Asiana Airlines
20 Dec - 03 Jan Alaska Airlines
12 Dec - 03 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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