Cheapest return flights from Washington to Singapore in September from $1011

AirHint found the following cheapest return flights from Washington (DCA) to Singapore (SIN) in September 2025 (see full year).

Return flights

08 Sep - 15 Sep Korean Air
16 Sep - 30 Sep Alaska Airlines
07 Sep - 15 Sep Singapore Airlines
05 Sep - 10 Sep Singapore Airlines
17 Sep - 08 Oct Japan Airlines
26 Sep - 12 Oct Cathay Pacific
27 Sep - 03 Oct EVA Air

Also check the deals for one-way flights from Washington 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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