Lindblad Expeditions is offering free round-trip airfare to Galápagos on 50+ cruise departures in 2017 and 2018 in commemoration of the 50th anniversary of Lars-Eric Lindblad’s first international tourist expedition to the islands, according to a statement.

The offer will be available for flights from Miami to Galápagos Aug. 25 – Nov. 17, 2017 on the National Geographic Endeavour II and Sept. 16 – Dec. 16, 2017 on the National Geographic Islander. It will also apply to additional departures on both ships in 2018, the company said, in a statement.