Cheapest return flights from Seattle to Singapore in October from $645

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

Return flights

23 Oct - 31 Oct Singapore Airlines direct
14 Oct - 16 Nov Singapore Airlines
24 Oct - 20 Nov Singapore Airlines direct
02 Oct - 10 Oct Singapore Airlines
05 Oct - 09 Nov Singapore Airlines
09 Oct - 06 Nov Air Canada
20 Oct - 28 Oct Korean Air
08 Oct - 05 Nov United
05 Oct - 09 Nov Singapore Airlines direct

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

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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