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

Return flights

01 May - 08 May	Icelandair
12 May - 18 May	Icelandair
01 May - 04 May	Icelandair
02 May - 09 May	Icelandair
06 May - 13 May	Spirit Airlines
03 May - 09 May	Icelandair
03 May - 13 May	Aer Lingus
14 May - 18 May	Icelandair
13 May - 19 May	Icelandair
01 May - 09 May	Icelandair
10 May - 10 Jun	Icelandair
01 May - 03 Jun	Icelandair
17 May - 07 Jun	Icelandair
19 May - 09 Jun	Icelandair
20 May - 19 Jun	Icelandair
20 May - 02 Jun	Icelandair
30 May - 06 Jun	Spirit Airlines
23 May - 01 Jun	WestJet
25 May - 02 Jun	Icelandair
26 May - 01 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 $474

Return flights