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

Return flights

30 Sep - 14 Oct	Iberia
28 Sep - 13 Oct	Iberia
23 Sep - 07 Oct	Turkish Airlines
23 Sep - 09 Oct	Turkish Airlines
21 Sep - 07 Oct	Turkish Airlines
24 Sep - 30 Sep	Austrian Airlines
28 Sep - 18 Oct	Iberia
27 Sep - 06 Oct	SWISS
27 Sep - 18 Oct	TAP
26 Sep - 18 Oct	Spirit Airlines
19 Sep - 25 Sep	KLM
16 Sep - 24 Sep	SWISS
15 Sep - 11 Oct	Aer Lingus
16 Sep - 23 Sep	Lufthansa
16 Sep - 30 Sep	Lufthansa
17 Sep - 25 Sep	Scandinavian Airlines
15 Sep - 23 Sep	Austrian Airlines
15 Sep - 22 Sep	Condor
21 Sep - 26 Sep	Iberia
22 Sep - 27 Sep	Austrian Airlines

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 505€

Return flights