Cheapest one-way flights from Seattle to Singapore in September from 274€

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

One-Way flights

28 Sep Philippine Airlines
15 Sep Korean Air
16 Sep Korean Air
08 Sep Korean Air
30 Sep Korean Air
13 Sep Korean Air
11 Sep WestJet
16 Sep Singapore Airlines direct
28 Sep Singapore Airlines direct
30 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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