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

Return flights

06 Mar - 09 Mar	Icelandair
03 Mar - 11 Mar	Icelandair
04 Mar - 17 Mar	TAP
06 Mar - 15 Mar	Icelandair
05 Mar - 13 Mar	Icelandair
10 Mar - 17 Mar	Icelandair
12 Mar - 16 Mar	Icelandair
27 Mar - 18 Apr	Icelandair
27 Mar - 12 Apr	Icelandair
18 Mar - 07 Apr	Icelandair
31 Mar - 14 Apr	Turkish Airlines
27 Mar - 05 Apr	Icelandair
29 Mar - 06 Apr	Icelandair
22 Mar - 29 Mar	Icelandair
19 Mar - 11 Apr	Icelandair
07 Mar - 10 Mar	Turkish Airlines
20 Mar - 24 Mar	Turkish Airlines
27 Mar - 04 Apr	Icelandair
11 Mar - 04 Apr	Icelandair
28 Mar - 06 Apr	Icelandair

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 $533

Return flights