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

Return flights

24 Sep - 29 Sep	Air France
24 Sep - 29 Sep	KLM	direct
30 Sep - 14 Oct	KLM
29 Sep - 07 Oct	KLM
25 Sep - 29 Sep	Ryanair
26 Sep - 30 Sep	Ryanair
22 Sep - 30 Sep	Delta
20 Sep - 25 Sep	KLM
20 Sep - 23 Sep	KLM
26 Sep - 30 Sep	KLM	direct
27 Sep - 30 Sep	Air France
25 Sep - 16 Oct	KLM	direct
25 Sep - 29 Sep	KLM	direct
29 Sep - 18 Oct	KLM
18 Sep - 12 Oct	Ryanair
26 Sep - 05 Oct	Lufthansa
26 Sep - 04 Oct	Ryanair
20 Sep - 17 Oct	Lufthansa
26 Sep - 05 Oct	KLM	direct
26 Sep - 04 Oct	KLM	direct

Also check the deals for one-way flights from Edinburgh to Boston 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 Edinburgh to Boston in September from 441€

Return flights