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

Return flights

11 May - 15 May	Ryanair
06 May - 12 May	Ryanair
02 May - 12 May	airBaltic
27 May - 03 Jun	Scandinavian Airlines
03 May - 12 May	Ryanair
14 May - 21 May	Norwegian Air Sweden AOC
15 May - 22 May	Ryanair
11 May - 18 May	Ryanair
20 May - 27 May	Scandinavian Airlines
07 May - 12 May	Ryanair
12 May - 16 May	Ryanair
29 May - 01 Jun	airBaltic
30 May - 08 Jun	airBaltic
29 May - 08 Jun	airBaltic
23 May - 01 Jun	airBaltic	direct
29 May - 01 Jun	airBaltic	direct
29 May - 08 Jun	airBaltic	direct
30 May - 08 Jun	TAP	direct

Also check the deals for one-way flights from Riga 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 Riga to Lisbon in May from 161€

Return flights