AirHint found the following cheapest return flights from Boston (BOS) to Frankfurt (FRA) in May 2026 (see full year).

Return flights

10 May - 24 May	TAP
18 May - 28 May	Condor	direct
18 May - 26 May	Condor	direct
13 May - 27 May	Condor
21 May - 05 Jun	Aer Lingus
21 May - 05 Jun	Condor	direct
20 May - 27 May	Icelandair
10 May - 17 May	Icelandair
05 May - 12 May	Icelandair
05 May - 12 May	Lufthansa	direct
25 May - 01 Jun	Icelandair
22 May - 06 Jun	Icelandair
10 May - 17 May	Lufthansa	direct
30 May - 06 Jun	Lufthansa

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

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 Frankfurt in May from 449€

Return flights