Cheapest one-way flights from Seattle to Singapore in September from 323€

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

One-Way flights

24 Sep Korean Air
25 Sep Korean Air
23 Sep Korean Air
14 Sep Singapore Airlines direct
22 Sep Asiana Airlines
17 Sep Korean Air
25 Sep Singapore Airlines direct
23 Sep Singapore Airlines direct

Also check the deals for return flights from Seattle to Singapore 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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