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

Return flights

07 Oct - 14 Oct	United
05 Oct - 14 Oct	United
26 Oct - 04 Nov	United
07 Oct - 10 Oct	Singapore Airlines	direct
22 Oct - 25 Oct	Asiana Airlines
07 Oct - 14 Oct	Singapore Airlines	direct
23 Oct - 26 Oct	United
03 Oct - 06 Oct	United
26 Oct - 04 Nov	Singapore Airlines	direct
23 Oct - 26 Oct	Singapore Airlines	direct
04 Oct - 07 Oct	Singapore Airlines	direct
25 Oct - 03 Nov	Delta
25 Oct - 02 Nov	Delta

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

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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Cheapest return flights from Seattle to Singapore in October from 568€

Return flights