Cheapest return flights from Seattle to Singapore in December from 713€

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
24 Dec - 05 Jan Turkish Airlines
14 Dec - 28 Dec United
25 Dec - 06 Jan Hawaiian Airlines
24 Dec - 04 Jan Turkish Airlines
02 Dec - 06 Jan KLM
25 Dec - 03 Jan Turkish Airlines
23 Dec - 03 Jan ANA
19 Dec - 30 Dec Alaska Airlines
19 Dec - 04 Jan Alaska Airlines
25 Dec - 06 Jan Singapore Airlines direct
25 Dec - 03 Jan Singapore Airlines direct
23 Dec - 03 Jan Singapore Airlines direct
19 Dec - 30 Dec 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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