AirHint found the following cheapest return flights from San Diego (SAN) to Athens (ATH) in September 2025 (see full year).

Return flights

08 Sep - 18 Sep	Spirit Airlines
10 Sep - 25 Sep	Frontier Airlines
02 Sep - 19 Sep	Delta
02 Sep - 23 Sep	Delta
03 Sep - 20 Sep	Spirit Airlines
24 Sep - 06 Oct	Air France
02 Sep - 20 Sep	Spirit Airlines
02 Sep - 09 Sep	United
29 Sep - 13 Oct	Lufthansa
29 Sep - 06 Oct	United
11 Sep - 19 Sep	Delta
08 Sep - 15 Sep	United
05 Sep - 12 Sep	United
26 Sep - 03 Oct	United

Also check the deals for one-way flights from San Diego to Athens 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 San Diego to Athens in September from 524€

Return flights