Jetstar will pull out of its Christchurch to Sydney service due to tough market conditions.
The Qantas subsidiary will suspend its five-times-a-week flights from the middle of October.
''We've been monitoring the route for some time due to its challenging commercial performance and have decided the capacity could be put to better use on routes where there is greater demand within the Qantas group network,'' a Jetstar spokesman said.
Passengers who have booked flights between Christchurch and Sydney from October 15 will be rebooked onto Qantas services on the same day or can request a full refund.
Qantas flies the route seven times a week.