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

Return flights

09 Mar - 13 Mar	Icelandair
11 Mar - 16 Mar	Icelandair
24 Mar - 11 Apr	Icelandair
17 Mar - 23 Mar	SWISS
12 Mar - 15 Mar	Icelandair
12 Mar - 23 Mar	Scandinavian Airlines
22 Mar - 11 Apr	TAP
16 Mar - 22 Mar	Icelandair
20 Mar - 24 Mar	Turkish Airlines
18 Mar - 29 Mar	Icelandair
27 Mar - 07 Apr	Aer Lingus
13 Mar - 25 Mar	Turkish Airlines
14 Mar - 20 Mar	Turkish Airlines
26 Mar - 05 Apr	Turkish Airlines
28 Mar - 18 Apr	Icelandair
17 Mar - 11 Apr	Aer Lingus
29 Mar - 05 Apr	Aer Lingus
27 Mar - 18 Apr	Aer Lingus
28 Mar - 06 Apr	Turkish Airlines
28 Mar - 05 Apr	Turkish Airlines

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 480€

Return flights