Cheapest one-way flights from Seattle to Singapore in December from $471

Best time to book flights for Seattle (SEA) to Singapore (SIN) flights at AirHint

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

One-Way flights

05 Dec Asiana Airlines
25 Dec Korean Air
24 Dec Korean Air
10 Dec Alaska Airlines
23 Dec China Airlines
21 Dec Air Canada
05 Dec Singapore Airlines direct
25 Dec Singapore Airlines direct
23 Dec Singapore Airlines direct
21 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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