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

Return flights

05 May - 10 May	Icelandair
01 May - 08 May	Icelandair
03 May - 23 May	Icelandair
12 May - 27 May	Icelandair
09 May - 15 May	Icelandair
06 May - 13 May	KLM
12 May - 19 May	Icelandair
21 May - 27 May	Icelandair
14 May - 18 May	Icelandair
13 May - 20 May	Icelandair
30 May - 10 Jun	Air Canada
26 May - 02 Jun	United
27 May - 03 Jun	Finnair
28 May - 04 Jun	Icelandair
26 May - 02 Jun	Aer Lingus	direct
29 May - 05 Jun	SWISS
31 May - 20 Jun	Air Canada
31 May - 07 Jun	British Airways
30 May - 06 Jun	TAP
29 May - 05 Jun	Aer Lingus	direct

Also check the deals for one-way flights from Chicago to Dublin 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.

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Cheapest return flights from Chicago to Dublin in May from $353

Return flights