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

Return flights

04 May - 12 May	Air Canada
03 May - 11 May	Air Canada
06 May - 20 May	Air France
01 May - 09 May	Turkish Airlines
02 May - 10 May	Turkish Airlines
20 May - 28 May	Air Canada
26 May - 02 Jun	WestJet
26 May - 03 Jun	WestJet
21 May - 29 May	Air Canada
25 May - 02 Jun	WestJet
29 May - 05 Jun	Volaris
28 May - 05 Jun	WestJet
29 May - 06 Jun	Volaris
22 May - 30 May	Volaris
27 May - 03 Jun	WestJet
31 May - 07 Jun	WestJet
25 May - 01 Jun	Volaris
31 May - 08 Jun	WestJet
23 May - 31 May	jetBlue

Also check the deals for one-way flights from Houston 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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Houston to Lisbon in May from 518€

Return flights