Cheapest return flights from Chicago to London in May from $482

Best time to book flights for Chicago (ORD) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Chicago (ORD) to London (LHR) in May 2025 (see full year).

Return flights

07 May - 17 May Icelandair
03 May - 12 May Icelandair
07 May - 18 May Icelandair
05 May - 19 May Icelandair
05 May - 12 May Icelandair
06 May - 15 May Icelandair
02 May - 11 May Icelandair
05 May - 14 May Icelandair
06 May - 13 May Icelandair
03 May - 10 May Icelandair
21 May - 02 Jun Icelandair
21 May - 04 Jun Icelandair
19 May - 13 Jun Finnair
20 May - 05 Jun Finnair
19 May - 13 Jun Iberia direct
20 May - 10 Jun Finnair
20 May - 12 Jun Iberia
21 May - 04 Jun British Airways direct
20 May - 10 Jun British Airways direct
20 May - 12 Jun British Airways direct

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

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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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