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

Return flights

11 May - 16 May	Ryanair
06 May - 11 May	Lufthansa
11 May - 18 May	airBaltic	direct
04 May - 09 May	Ryanair
31 May - 05 Jun	Ryanair
30 May - 06 Jun	TAP
01 May - 06 May	Ryanair
30 May - 04 Jun	TAP
29 May - 31 May	Ryanair
30 May - 05 Jun	TAP
23 May - 29 May	KLM
01 May - 04 May	airBaltic	direct
30 May - 01 Jun	Lufthansa
04 May - 09 May	airBaltic	direct
23 May - 29 May	TAP	direct
30 May - 01 Jun	TAP	direct
30 May - 05 Jun	TAP	direct
30 May - 06 Jun	TAP	direct

Also check the deals for one-way flights from Lisbon to Riga 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 Lisbon to Riga in May from 225€

Return flights