Cheapest return flights from Seattle to Singapore in December from 884€

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

Return flights

27 Dec - 16 Jan Asiana Airlines
22 Dec - 28 Dec Asiana Airlines
21 Dec - 30 Dec Alaska Airlines
21 Dec - 30 Dec Singapore Airlines direct
20 Dec - 29 Dec Delta

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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