Cheapest return flights from Boston to Frankfurt in September from $431

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

Return flights

12 Sep - 14 Sep Icelandair
01 Sep - 03 Sep American Airlines
20 Sep - 30 Sep Icelandair
20 Sep - 01 Oct Icelandair
22 Sep - 08 Oct Icelandair
16 Sep - 30 Sep Icelandair
26 Sep - 10 Oct TAP
27 Sep - 05 Oct TAP
26 Sep - 05 Oct TAP
26 Sep - 03 Oct TAP
02 Sep - 09 Sep Icelandair
05 Sep - 12 Sep Icelandair
14 Sep - 21 Sep Icelandair
06 Sep - 13 Sep Icelandair
28 Sep - 05 Oct Icelandair
23 Sep - 30 Sep Icelandair
01 Sep - 03 Sep Condor direct
18 Sep - 16 Oct Aer Lingus
23 Sep - 07 Oct Condor direct
22 Sep - 08 Oct Lufthansa direct

Also check the deals for one-way flights from Boston to Frankfurt in September.

Skyscanner

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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