AirHint found the following cheapest return flights from Quito (UIO) to San Salvador (SAL) in September 2025 (see full year).

Return flights

02 Sep - 12 Sep	Avianca
07 Sep - 10 Sep	Avianca
02 Sep - 05 Sep	Avianca
12 Sep - 20 Sep	Copa
23 Sep - 30 Sep	Copa
07 Sep - 12 Sep	Copa
06 Sep - 15 Sep	Copa
06 Sep - 16 Sep	Copa
13 Sep - 16 Sep	Copa
24 Sep - 01 Oct	Copa
26 Sep - 30 Sep	Copa
27 Sep - 01 Oct	Copa

Also check the deals for one-way flights from Quito to San Salvador in September.

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 Quito to San Salvador in September from 101€

Return flights