Cheapest one-way flights from Seattle to Singapore in September from 447€

Best time to book flights for Seattle (SEA) to Singapore (SIN) flights at AirHint

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

One-Way flights

21 Sep Japan Airlines
21 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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