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

Return flights

22 Aug - 31 Aug	EVA Air
23 Aug - 07 Sep	United
24 Aug - 08 Sep	United
31 Aug - 07 Sep	United
12 Aug - 21 Aug	Air Canada
14 Aug - 17 Aug	Air Canada
10 Aug - 24 Aug	Air Canada
11 Aug - 20 Aug	EVA Air
07 Aug - 12 Aug	EVA Air
02 Aug - 12 Aug	EVA Air
09 Aug - 30 Aug	EVA Air
16 Aug - 01 Sep	EVA Air
11 Aug - 21 Aug	United
09 Aug - 19 Aug	Delta

Also check the deals for one-way flights from Singapore to Seattle 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 Singapore to Seattle in August from $821

Return flights