Cheapest return flights from Seattle to Singapore in December from $687

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

Return flights

02 Dec - 09 Dec Singapore Airlines direct
03 Dec - 13 Dec Air Canada
21 Dec - 28 Dec Asiana Airlines
19 Dec - 26 Dec Asiana Airlines
21 Dec - 28 Dec Singapore Airlines direct
19 Dec - 26 Dec Singapore Airlines direct
19 Dec - 02 Jan Air Canada
19 Dec - 02 Jan Singapore Airlines direct

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

Skyscanner

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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