Two National Party MPs have racked up a combined bill of $200,000 chartering private flights to and from their electorates to attend sessions of Parliament in Canberra since the change of government.

Spending on jet hire to Canberra for sitting weeks is filed by the Finance Department under the little-known expense category of "special minister of state-approved" flights.

Federal Transport Minister Darren Chester is in favour of using existing rail network infrastructure. Credit:Jamila Toderas

NSW National Mark Coulton, who represents the sprawling north-western NSW electorate of Parkes and Darren Chester, whose Victorian seat of Gippsland is 10 times smaller, are the two MPs approved to charter flights for sitting weeks.

Department of Finance records show the pair have spent $198,000 between them since the Coalition took power in 2013.