Cheapest one-way flights from Singapore to Seattle in September from $485

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

One-Way flights

23 Sep Air Canada
25 Sep Air Canada
21 Sep Air Canada
12 Sep United
23 Sep Singapore Airlines direct
21 Sep Singapore Airlines direct
19 Sep Singapore Airlines
22 Sep Delta
26 Sep Delta
12 Sep Singapore Airlines direct

Also check the deals for return flights from Singapore to Seattle in September.

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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