AirHint found the following cheapest return flights from St. Louis (STL) to London (LHR) in March 2026 (see full year).

Return flights

25 Mar - 31 Mar	Delta
15 Mar - 23 Mar	Air Canada
15 Mar - 22 Mar	Delta
26 Mar - 29 Mar	Air Canada
07 Mar - 14 Mar	Air France
14 Mar - 22 Mar	Delta
14 Mar - 21 Mar	Delta
13 Mar - 18 Mar	Delta
18 Mar - 21 Mar	Delta

Also check the deals for one-way flights from St. Louis to London in March.

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 London

Cheap car rent in London

Cheapest return flights from St. Louis to London in March from 546€

Return flights