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

Return flights

08 May - 14 May	Icelandair
14 May - 17 May	Icelandair
08 May - 30 May	TAP
10 May - 10 Jun	TAP
01 May - 08 May	Icelandair
06 May - 30 May	TAP
05 May - 30 May	Icelandair
07 May - 30 May	Icelandair
12 May - 06 Jun	Aer Lingus
16 May - 30 May	Icelandair
22 May - 07 Jun	Air Canada
18 May - 13 Jun	Icelandair
25 May - 20 Jun	Aer Lingus
24 May - 13 Jun	TAP
23 May - 01 Jun	Aer Lingus

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Chicago to London in May from 471€

Return flights