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

Return flights

10 Sep - 18 Sep	Air Canada
03 Sep - 11 Sep	United
07 Sep - 16 Sep	United
26 Sep - 07 Oct	Delta
04 Sep - 11 Sep	United
24 Sep - 01 Oct	United
04 Sep - 09 Sep	Frontier Airlines
10 Sep - 17 Sep	United
15 Sep - 22 Sep	United
04 Sep - 12 Sep	United
09 Sep - 16 Sep	United
26 Sep - 03 Oct	United
16 Sep - 23 Sep	United
30 Sep - 07 Oct	United
29 Sep - 06 Oct	United
28 Sep - 05 Oct	United

Also check the deals for one-way flights from Austin 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 Austin to Athens in September from 590€

Return flights