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	Finnair
10 Dec - 17 Dec	Lufthansa	direct
02 Dec - 09 Dec	Lufthansa
07 Dec - 14 Dec	Lufthansa	direct
10 Dec - 21 Dec	United
12 Dec - 19 Dec	Lufthansa	direct
10 Dec - 21 Dec	Lufthansa	direct
17 Dec - 24 Dec	Lufthansa
21 Dec - 02 Jan	Air Canada
19 Dec - 26 Dec	Lufthansa
20 Dec - 02 Jan	Air Canada
20 Dec - 01 Jan	Air Canada
27 Dec - 03 Jan	United
19 Dec - 26 Dec	Lufthansa	direct
18 Dec - 02 Jan	United
19 Dec - 02 Jan	Air Canada
19 Dec - 03 Jan	Air Canada
21 Dec - 02 Jan	Lufthansa	direct
19 Dec - 02 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 606€

Return flights