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

Return flights

06 May - 13 May	Iberia Express
25 May - 28 May	TAP	direct
25 May - 27 May	TAP	direct
05 May - 10 May	Ryanair	direct
09 May - 10 May	Ryanair	direct
07 May - 10 May	Ryanair	direct
06 May - 10 May	Ryanair	direct
15 May - 15 May	TAP	direct
05 May - 13 May	Ryanair	direct
09 May - 26 May	Ryanair	direct
27 May - 01 Jun	Iberia Express
25 May - 06 Jun	Ryanair	direct
18 May - 06 Jun	Ryanair	direct
29 May - 01 Jun	SWISS
23 May - 06 Jun	Ryanair	direct
25 May - 01 Jun	Ryanair	direct
18 May - 01 Jun	Ryanair	direct
27 May - 06 Jun	Ryanair	direct
16 May - 06 Jun	Ryanair	direct
16 May - 01 Jun	Ryanair	direct

Also check the deals for one-way flights from Dublin to Lisbon 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 Dublin to Lisbon in May from 232CAD

Return flights