Cheapest one-way flights from Seattle to Singapore in December from $396

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

One-Way flights

07 Dec Asiana Airlines
07 Dec Singapore Airlines direct
10 Dec Alaska Airlines
25 Dec Alaska Airlines
24 Dec China Airlines
15 Dec China Airlines
23 Dec EVA Air
18 Dec Alaska Airlines
23 Dec Singapore Airlines direct
25 Dec Singapore Airlines direct

Also check the deals for return 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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