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

Return flights

06 May - 13 May	Air Canada
05 May - 13 May	Air Canada
06 May - 14 May	Air Canada
04 May - 12 May	KLM
03 May - 11 May	Air Canada
04 May - 11 May	KLM
03 May - 10 May	Air Canada
13 May - 21 May	Air Canada
01 May - 08 May	KLM
11 May - 19 May	Lufthansa
25 May - 01 Jun	Spirit Airlines
24 May - 01 Jun	Spirit Airlines
26 May - 02 Jun	Delta

Also check the deals for one-way flights from Charlotte 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 Charlotte to Lisbon in May from 435€

Return flights