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

Return flights

01 Mar - 08 Mar	TAP
01 Mar - 10 Mar	TAP
23 Mar - 30 Mar	Icelandair
09 Mar - 15 Mar	Icelandair
03 Mar - 10 Mar	Icelandair
04 Mar - 09 Mar	Icelandair
02 Mar - 09 Mar	Icelandair
08 Mar - 15 Mar	Icelandair
10 Mar - 15 Mar	Icelandair
17 Mar - 24 Mar	Icelandair
25 Mar - 01 Apr	Finnair
25 Mar - 01 Apr	British Airways	direct
17 Mar - 06 Apr	Finnair
27 Mar - 07 Apr	Aer Lingus
27 Mar - 15 Apr	Aer Lingus
29 Mar - 04 Apr	Air Canada
28 Mar - 04 Apr	Air Canada
26 Mar - 05 Apr	Lufthansa
17 Mar - 06 Apr	British Airways	direct
27 Mar - 13 Apr	Aer Lingus

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 372€

Return flights