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

Return flights

21 Apr - 23 Apr	Delta
15 Apr - 29 Apr	Scandinavian Airlines
21 Apr - 05 May	Finnair
21 Apr - 06 May	Finnair
14 Apr - 21 Apr	Delta
22 Apr - 29 Apr	Delta
07 Apr - 14 Apr	Delta
29 Apr - 06 May	Delta
15 Apr - 29 Apr	Iberia	direct
21 Apr - 05 May	Iberia	direct
21 Apr - 06 May	Iberia	direct
28 Apr - 05 May	Delta
15 Apr - 22 Apr	Delta
01 Apr - 08 Apr	Delta
17 Apr - 24 Apr	Delta
20 Apr - 27 Apr	Delta
24 Apr - 01 May	Delta
26 Apr - 03 May	Delta
27 Apr - 04 May	Delta
30 Apr - 07 May	Delta

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

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 April from 494€

Return flights