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

Return flights

15 Mar - 25 Mar	Air France
02 Mar - 10 Mar	Delta
12 Mar - 20 Mar	Delta
03 Mar - 08 Mar	Air France
06 Mar - 09 Mar	Delta
17 Mar - 30 Mar	Virgin Atlantic
13 Mar - 20 Mar	Delta
07 Mar - 14 Mar	Delta
23 Mar - 29 Mar	Delta
21 Mar - 27 Mar	Air France

Also check the deals for one-way flights from Chicago 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.

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Cheapest return flights from Chicago to London in March from 445€

Return flights