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

Return flights

30 Sep - 25 Oct	jetBlue	direct
22 Sep - 18 Oct	Aer Lingus
20 Sep - 26 Sep	KLM
21 Sep - 11 Oct	Aer Lingus
28 Sep - 07 Oct	Icelandair
23 Sep - 18 Oct	jetBlue
27 Sep - 18 Oct	Icelandair
23 Sep - 30 Sep	SWISS
24 Sep - 01 Oct	Austrian Airlines
27 Sep - 18 Oct	jetBlue	direct
25 Sep - 18 Oct	Lufthansa
28 Sep - 07 Oct	Delta	direct
23 Sep - 30 Sep	jetBlue	direct
24 Sep - 28 Sep	Delta	direct
20 Sep - 26 Sep	Delta	direct

Also check the deals for one-way flights from Boston to Edinburgh 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 Edinburgh in September from $527

Return flights