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

Return flights

04 Mar - 10 Mar	Scandinavian Airlines
12 Mar - 19 Mar	Scandinavian Airlines
04 Mar - 13 Mar	Scandinavian Airlines
09 Mar - 16 Mar	Icelandair
03 Mar - 10 Mar	Delta
11 Mar - 18 Mar	Delta
10 Mar - 17 Mar	Delta
04 Mar - 13 Mar	British Airways	direct
17 Mar - 24 Mar	Delta
04 Mar - 11 Mar	Delta
31 Mar - 07 Apr	Delta
30 Mar - 06 Apr	Finnair
30 Mar - 06 Apr	Iberia	direct
26 Mar - 02 Apr	Delta
27 Mar - 03 Apr	Delta
29 Mar - 05 Apr	Delta
28 Mar - 04 Apr	Delta
29 Mar - 01 Apr	Delta
31 Mar - 03 Apr	Delta
30 Mar - 02 Apr	Delta

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 354€

Return flights