Cheapest return flights from St. Louis to London in March from $635

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

Return flights

10 Mar - 17 Mar Air Canada
04 Mar - 11 Mar Air Canada
31 Mar - 06 Apr British Airways
10 Mar - 15 Mar Air Canada
11 Mar - 15 Mar Air Canada
07 Mar - 14 Mar Air Canada
20 Mar - 23 Mar Air Canada
20 Mar - 30 Mar Air Canada
26 Mar - 29 Mar United
25 Mar - 29 Mar Air Canada
12 Mar - 15 Mar Air Canada
29 Mar - 03 Apr Aer Lingus
28 Mar - 03 Apr Air Canada

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

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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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