The low-cost airline leased two A220-300s from Avation earlier in the year and these additional planes will be delivered directly from the final assembly line in the second quarter of 2019.
As with the other single-aisle aircraft, airBaltic has agreed to lease the new planes for 12 years.
“We believe the A220-300 is an excellent, highly fuel-efficient new technology aircraft,” said Avation executive chairman Jeff Chatfield.
“We are growing our fleet with four more A220-300 aircraft leased to airBaltic and we are very proud to be expanding our partnership with this growing and popular airline.”
Vitold Jakovlevs, the chief financial officer of airBaltic added: “Avation has again demonstrated their competitiveness which, combined with our good experience with the first two aircraft, is why we have selected them a second time.”