AirHint found the following cheapest return flights from Seattle (SEA) to Singapore (SIN) in August 2025 (see full year).

Return flights

07 Aug - 14 Aug	Korean Air
13 Aug - 20 Aug	Korean Air
22 Aug - 23 Sep	Air Canada
21 Aug - 23 Sep	Air Canada
05 Aug - 03 Sep	United
11 Aug - 18 Aug	Asiana Airlines
21 Aug - 31 Aug	United
07 Aug - 05 Sep	United
22 Aug - 08 Sep	United
10 Aug - 17 Aug	Asiana Airlines
26 Aug - 30 Aug	United
08 Aug - 15 Aug	Asiana Airlines
17 Aug - 23 Aug	Korean Air
03 Aug - 06 Aug	Korean Air
08 Aug - 14 Aug	Air Canada

Also check the deals for one-way flights from Seattle to Singapore in August.

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 return flights from Seattle to Singapore in August from 614€

Return flights