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

Return flights

16 Apr - 29 Apr	Icelandair
13 Apr - 19 Apr	Icelandair
24 Apr - 27 Apr	Icelandair
22 Apr - 19 May	Icelandair
14 Apr - 19 Apr	Icelandair
19 Apr - 23 Apr	Icelandair
26 Apr - 30 Apr	Icelandair
12 Apr - 21 Apr	Icelandair
17 Apr - 21 Apr	Icelandair
13 Apr - 20 Apr	Icelandair
16 Apr - 23 Apr	Icelandair
21 Apr - 07 May	Icelandair
24 Apr - 06 May	Icelandair
17 Apr - 06 May	Icelandair
28 Apr - 05 May	Icelandair
15 Apr - 06 May	Icelandair
26 Apr - 11 May	Icelandair
30 Apr - 15 May	Icelandair
22 Apr - 01 May	Icelandair
20 Apr - 05 May	Aer Lingus

Also check the deals for one-way flights from Chicago to London in April.

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 April from 423€

Return flights