QantasLink chief John Gissing said all of the airline's planes would be upgraded from Q300s to Q400s, which seat 76 passengers.

Despite increasing their Wagga to Sydney route, the national carrier has no plans to begin a Wagga to Melbourne service.

That route will remain serviced by Regional Express (Rex) airlines.

A Qantas spokeswoman said the new planes were faster, with 52 flights a week operating on the route.

Alicia Chapple from Rex Airlines denied Qantas's extra seats would impact the airline.

"Rex currently competes with a mix of QantasLink 50 and 74 seat aircraft and Rex does not believe that the announced QantasLink changes will affect Rex's competitiveness in Wagga," Ms Chapple said.

"In October, 2014, Rex operated 276 flights between Wagga and Sydney with a 91 per cent on-time performance, in comparison to (QantasLink) who operated 232 flights between Wagga and Sydney with an 84 per cent on-time performance."

Ms Chapple said Rex had increased its daily flights to Sydney from four in 2013 to five.

Mr Gissing said the changes showed QantaLink's continued to commitment to regional communities.

"These changes are part of our plan to ensure QantasLink remains Australia's leading regional carrier," he said.

"We know QantasLink is more than just an airline in many regional communities and these changes will ensure we have a strong foundation for the future."

QantasLink's changes come into effect on March 29, 2015.