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

Return flights

04 Mar - 09 Mar	Icelandair
04 Mar - 14 Mar	TAP
04 Mar - 08 Mar	Icelandair
10 Mar - 24 Mar	Icelandair
03 Mar - 17 Mar	SWISS
11 Mar - 24 Mar	Icelandair
01 Mar - 06 Mar	Icelandair
01 Mar - 05 Mar	Icelandair
04 Mar - 10 Mar	Icelandair
17 Mar - 24 Mar	Icelandair
25 Mar - 01 Apr	Aer Lingus
16 Mar - 29 Apr	Spirit Airlines
30 Mar - 30 Apr	Spirit Airlines
30 Mar - 06 Apr	Air Canada
15 Mar - 14 Apr	British Airways
26 Mar - 01 Apr	Air Canada
17 Mar - 06 Apr	Icelandair
31 Mar - 07 Apr	British Airways
17 Mar - 05 Apr	Icelandair
18 Mar - 07 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 $436

Return flights