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

Return flights

08 Mar - 14 Mar	Icelandair
05 Mar - 14 Mar	Icelandair
05 Mar - 08 Mar	Icelandair
05 Mar - 09 Mar	Icelandair
04 Mar - 13 Mar	Icelandair
10 Mar - 18 Mar	Icelandair
03 Mar - 08 Mar	Icelandair
07 Mar - 14 Mar	Icelandair
08 Mar - 13 Mar	Icelandair
25 Mar - 29 Mar	Icelandair
25 Mar - 02 Apr	Icelandair
25 Mar - 01 Apr	Icelandair
28 Mar - 03 Apr	Icelandair
27 Mar - 12 Apr	Icelandair
27 Mar - 05 Apr	Icelandair
28 Mar - 04 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 $493

Return flights