Cheapest return ORD–LHR flights, May

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

Return flights

13 May - 20 May Lufthansa
12 May - 20 May Aer Lingus
11 May - 20 May Aer Lingus
10 May - 19 May Air Canada
12 May - 22 May United
13 May - 21 May United
13 May - 19 May Delta
12 May - 21 May Delta
13 May - 20 May Finnair direct
26 May - 16 Jun Air Canada
11 May - 20 May British Airways direct
28 May - 04 Jun Air Canada
26 May - 02 Jun Air Canada
24 May - 01 Jun Air Canada
28 May - 01 Jun Air Canada
28 May - 08 Jun Air Canada
25 May - 01 Jun Air Canada
25 May - 15 Jun Icelandair
23 May - 17 Jun WestJet
17 May - 10 Jun Icelandair

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

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