AirHint found the following cheapest return flights from St. Louis (STL) to Frankfurt (FRA) in December 2025 (see full year).

Return flights

03 Dec - 10 Dec	Lufthansa	direct
08 Dec - 15 Dec	Lufthansa
10 Dec - 14 Dec	Air Canada
23 Dec - 30 Dec	United
21 Dec - 10 Jan	Air Canada
28 Dec - 04 Jan	Lufthansa	direct
13 Dec - 20 Dec	United
18 Dec - 25 Dec	United
21 Dec - 28 Dec	Air Canada
21 Dec - 28 Dec	Lufthansa	direct
21 Dec - 24 Dec	Alaska Airlines
19 Dec - 22 Dec	Lufthansa
19 Dec - 04 Jan	Air Canada
19 Dec - 04 Jan	Lufthansa	direct

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

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.

Book a cheap hotel in Frankfurt

Cheap car rent in Frankfurt

Cheapest return flights from St. Louis to Frankfurt in December from $851

Return flights