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

Return flights

04 Mar - 10 Mar	Icelandair
08 Mar - 18 Mar	Icelandair
02 Mar - 13 Mar	Icelandair
08 Mar - 17 Mar	Icelandair
31 Mar - 14 Apr	Frontier Airlines
25 Mar - 08 Apr	Lufthansa
06 Mar - 15 Mar	Turkish Airlines
01 Mar - 16 Mar	Iberia
25 Mar - 01 Apr	Iberia
15 Mar - 23 Mar	Lufthansa
07 Mar - 15 Mar	Turkish Airlines
03 Mar - 13 Mar	Icelandair
01 Mar - 08 Mar	Air Canada
25 Mar - 18 Apr	Spirit Airlines
29 Mar - 16 Apr	Spirit Airlines
28 Mar - 08 Apr	Spirit Airlines
29 Mar - 05 Apr	SWISS
27 Mar - 10 Apr	Frontier Airlines
25 Mar - 04 Apr	Air Canada
27 Mar - 05 Apr	Spirit 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 420€

Return flights