Cheapest return flights from Seattle to Singapore in September from 527€

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

Return flights

19 Sep - 02 Oct Singapore Airlines direct
09 Sep - 16 Sep United
05 Sep - 22 Sep United
16 Sep - 26 Sep United
13 Sep - 28 Sep United
30 Sep - 18 Oct Korean Air
02 Sep - 07 Sep Korean Air
01 Sep - 06 Sep United
17 Sep - 30 Sep Delta

Also check the deals for one-way flights from Seattle 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.

Book a cheap hotel in Singapore

Cheap car rent in Singapore

Feel free to contact us with any feedback or request another flight research.