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

Return flights

19 May - 09 Jun	Condor
29 May - 03 Jun	Condor
26 May - 16 Jun	Condor
05 May - 12 May	Lufthansa
20 May - 27 May	Delta
22 May - 03 Jun	Condor
27 May - 17 Jun	Aer Lingus
02 May - 09 May	Lufthansa
08 May - 15 May	Lufthansa
11 May - 18 May	Lufthansa
16 May - 23 May	Lufthansa
27 May - 17 Jun	Lufthansa	direct
26 May - 02 Jun	Lufthansa
31 May - 07 Jun	Lufthansa	direct
22 May - 03 Jun	Lufthansa	direct
29 May - 03 Jun	Lufthansa	direct
21 May - 28 May	Lufthansa

Also check the deals for one-way flights from St. Louis 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 St. Louis to Frankfurt in May from $846

Return flights