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

03 May - 19 May Icelandair
03 May - 12 May Icelandair
01 May - 05 May Icelandair
01 May - 07 May Icelandair
04 May - 04 Jun Frontier Airlines
05 May - 11 May Air Canada
01 May - 27 May Icelandair
13 May - 19 May Icelandair
01 May - 28 May Icelandair
08 May - 13 May Icelandair
04 May - 13 May Frontier Airlines
17 May - 05 Jun Air Canada
17 May - 03 Jun Air Canada
17 May - 06 Jun Air Canada
27 May - 02 Jun Air Canada
25 May - 02 Jun Air Canada
13 May - 04 Jun Frontier Airlines
10 May - 10 Jun Aer Lingus
05 May - 16 Jun Delta
24 May - 01 Jun Air Canada

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

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