Cheapest return flights from Seattle to Singapore in December from $1342

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

Return flights

13 Dec - 28 Dec United
11 Dec - 18 Dec Air Canada
14 Dec - 21 Dec Air Canada
13 Dec - 18 Dec China Airlines
26 Dec - 02 Jan Air Canada
15 Dec - 22 Dec Delta
17 Dec - 24 Dec Delta
12 Dec - 19 Dec Air Canada
26 Dec - 02 Jan Singapore Airlines direct
19 Dec - 04 Jan Hawaiian Airlines

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

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