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

Return flights

22 Sep - 29 Sep	Iberia
28 Sep - 15 Oct	Iberia
21 Sep - 29 Sep	Icelandair
21 Sep - 30 Sep	Icelandair
14 Sep - 30 Sep	Icelandair
20 Sep - 29 Sep	Icelandair
01 Sep - 15 Sep	Iberia
26 Sep - 29 Sep	Icelandair
21 Sep - 28 Sep	Icelandair
08 Sep - 15 Sep	Spirit Airlines
01 Sep - 08 Sep	Icelandair
28 Sep - 13 Oct	Iberia
23 Sep - 07 Oct	Air Canada
26 Sep - 05 Oct	Iberia
04 Sep - 02 Oct	Spirit Airlines
24 Sep - 05 Oct	Icelandair
27 Sep - 10 Oct	jetBlue
26 Sep - 10 Oct	Iberia
27 Sep - 04 Oct	Icelandair
27 Sep - 06 Oct	Aer Lingus

Also check the deals for one-way flights from Boston 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 Boston to Athens in September from $456

Return flights