AirHint found the following cheapest one-way flights from Seattle (SEA) to Singapore (SIN) in May 2026 (see full year).

One-Way flights

22 May	Asiana Airlines
23 May	Asiana Airlines
24 May	Asiana Airlines
25 May	Asiana Airlines
26 May	Asiana Airlines
22 May	Singapore Airlines	direct
26 May	Singapore Airlines	direct
23 May	Singapore Airlines	direct
24 May	Singapore Airlines	direct

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

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 one-way flights from Seattle to Singapore in May from $568

One-Way flights