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

Return flights

10 May - 22 May	Icelandair
06 May - 12 May	TAP
12 May - 18 May	Icelandair
15 May - 06 Jun	TAP
06 May - 30 May	TAP
07 May - 30 May	Icelandair
13 May - 06 Jun	TAP
18 May - 31 May	Icelandair
20 May - 03 Jun	Icelandair
06 May - 11 May	British Airways
12 May - 06 Jun	Icelandair
07 May - 11 May	British Airways
18 May - 25 May	Icelandair
17 May - 25 May	Icelandair
18 May - 13 Jun	Icelandair
23 May - 13 Jun	WestJet
21 May - 13 Jun	Icelandair
29 May - 30 Jun	WestJet
23 May - 01 Jun	WestJet
29 May - 20 Jun	Icelandair

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

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 May from 490€

Return flights