Eastern Airways’ Teesside airport to Newquay summer service is to run year round.
The twice-weekly service started on July 6 and capacity has been raised with the use of larger aircraft due to demand for the Cornwall connection.
Flights will now continue beyond September on Mondays and Fridays.
The regional carrier is also starting to serve Southampton from Teesside on September 25 as well as three flights a week to Dublin on the same day.
KLM also restarts a route from the north-east airport to Amsterdam on Monday with an initial daily frequency.
Eastern Airways’ commercial and operations general manager Roger Hage said: “The initial response to adding Newquay to the growing mix of Teesside services in our partnership with the airport has been very positive and why such a service can be sustainable year-round.
“This helps give not simply Teesside locally, but the wider North Yorkshire, Durham and Northumberland year-round access to the south-west and vice-versa, all helping business and tourism related economic recovery.”
Tees Valley ayor Ben Houchen (pictured) said: “When we were planning the introduction of the flight to Newquay we knew it would be popular, but everyone has been blown away by just how popular. We never expected that we would have to increasing capacity and make it a year-round service within days of its launch.”