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

Return flights

02 Mar - 24 Mar	Aer Lingus
25 Mar - 29 Mar	Icelandair
17 Mar - 22 Mar	Icelandair
07 Mar - 14 Mar	Icelandair
22 Mar - 27 Mar	Icelandair
18 Mar - 23 Mar	Icelandair
22 Mar - 29 Mar	Icelandair
14 Mar - 20 Mar	Icelandair
07 Mar - 20 Mar	Icelandair
29 Mar - 07 Apr	TAP
20 Mar - 27 Mar	Turkish Airlines
27 Mar - 02 Apr	Turkish Airlines
31 Mar - 25 Apr	SWISS
20 Mar - 11 Apr	TAP
15 Mar - 04 Apr	Aer Lingus
27 Mar - 06 Apr	Turkish Airlines
27 Mar - 18 Apr	Aer Lingus
28 Mar - 04 Apr	Turkish Airlines
27 Mar - 04 Apr	Lufthansa
13 Mar - 04 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 472€

Return flights