Cheapest return flights from Seattle to Singapore in December from 697€

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

Return flights

08 Dec - 13 Dec Asiana Airlines
02 Dec - 19 Dec United
01 Dec - 05 Dec Asiana Airlines
02 Dec - 19 Dec Singapore Airlines direct
10 Dec - 14 Dec Alaska Airlines
25 Dec - 13 Jan Hainan Airlines
15 Dec - 17 Jan STARLUX Airlines
24 Dec - 13 Jan United
24 Dec - 12 Jan China Airlines
21 Dec - 13 Jan United
24 Dec - 11 Jan China Airlines
16 Dec - 18 Jan Asiana Airlines
22 Dec - 12 Jan Frontier Airlines
13 Dec - 20 Dec Alaska Airlines
23 Dec - 11 Jan Korean Air
14 Dec - 28 Dec United
09 Dec - 03 Jan Hawaiian Airlines
09 Dec - 14 Dec Singapore Airlines direct
13 Dec - 20 Dec Singapore Airlines direct

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

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