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

Return flights

08 May - 15 May	Iberia
13 May - 20 May	Finnair
14 May - 21 May	Iberia
10 May - 18 May	Finnair
08 May - 25 May	Iberia
09 May - 25 May	Iberia
13 May - 23 May	Finnair
26 May - 02 Jun	Air Canada
20 May - 25 May	Iberia
21 May - 25 May	Finnair
17 May - 09 Jun	Iberia
05 May - 12 May	United	direct
29 May - 05 Jun	Iberia
27 May - 03 Jun	TAP
31 May - 30 Jun	Iberia
28 May - 04 Jun	Iberia
26 May - 09 Jun	Iberia
31 May - 07 Jun	TAP
30 May - 06 Jun	TAP
31 May - 07 Jun	TAP	direct

Also check the deals for one-way flights from Newark 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 Newark to Lisbon in May from 446€

Return flights