Cheapest return flights from Seattle to Singapore in December from 683€

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

Return flights

01 Dec - 11 Dec Korean Air
03 Dec - 12 Dec United
09 Dec - 23 Dec Air Canada
09 Dec - 24 Dec United
11 Dec - 26 Dec Air Canada
10 Dec - 24 Dec Hawaiian Airlines
14 Dec - 28 Dec Frontier Airlines
09 Dec - 23 Dec Singapore Airlines direct
11 Dec - 26 Dec Singapore Airlines direct
23 Dec - 30 Dec Air Canada
19 Dec - 03 Jan Air Canada
19 Dec - 04 Jan Korean Air

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

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