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

Return flights

06 May - 22 May	Icelandair
04 May - 14 May	Icelandair
05 May - 15 May	Spirit Airlines
13 May - 19 May	Spirit Airlines
03 May - 13 May	Spirit Airlines
08 May - 18 May	Icelandair
07 May - 18 May	Icelandair
13 May - 20 May	Icelandair
01 May - 15 May	Icelandair
11 May - 21 May	Icelandair
10 May - 10 Jun	Icelandair
23 May - 01 Jun	Spirit Airlines
28 May - 04 Jun	Spirit Airlines
27 May - 03 Jun	Spirit Airlines
31 May - 14 Jun	Spirit Airlines
28 May - 07 Jun	Spirit Airlines
29 May - 07 Jun	WestJet
24 May - 24 Jun	Spirit Airlines

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 436€

Return flights