Cheapest return flights from St. Louis (STL) to London (LHR), December

20 dates in December, from $ 910. Book in one tap, or check whether to buy now or wait.

One-wayReturn
Dates, airline, and price
Dates Airline Price
2 Dec 8 Dec Frontier Airlines
29 Dec 13 Jan 2027 Air Canada
28 Dec 15 Jan 2027 Air Canada
1 Dec 8 Dec Air Canada
3 Dec 7 Dec Frontier Airlines
7 Dec 13 Dec Delta
6 Dec 12 Dec Air Canada
11 Dec 18 Dec Iberia
6 Dec 11 Dec Frontier Airlines
11 Dec 25 Dec United
15 Dec 22 Dec United
28 Dec 7 Jan 2027 Delta
14 Dec 31 Dec Frontier Airlines
25 Dec 7 Jan 2027 Air Canada
27 Dec 7 Jan 2027 Lufthansa
16 Dec 6 Jan 2027 Frontier Airlines
27 Dec 6 Jan 2027 Lufthansa
26 Dec 8 Jan 2027 KLM
27 Dec 8 Jan 2027 Delta
15 Dec 4 Jan 2027 Air Canada
Powered by

Cheapest deals for the full year

Deals for one-way flights from St. Louis to London in December.

Book a cheap hotel in London

Cheap car rent in Heathrow

Updated Oct 13, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

Feel free to contact us with any feedback or request another flight research.