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

One-Way flights

03 May	Philippine Airlines
06 May	Philippine Airlines
10 May	Philippine Airlines
13 May	Philippine Airlines
15 May	Philippine Airlines
01 May	Philippine Airlines
02 May	Asiana Airlines
09 May	Asiana Airlines
20 May	Asiana Airlines
18 May	Asiana Airlines

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 $298

One-Way flights