Qantas will raise the cost of domestic and international airfares by up to $30 each way next month, in response to ever-increasing costs for jet fuel.

From April 5, domestic Qantas and QantasLink fares will go up by an average of 5%.

Typical increases include $7 for trips between Sydney and Melbourne, $10 for Melbourne-Brisbane and also $10 for the cross-country trek between Sydney and Perth.

The fuel surcharge levied on Qantas Frequent Flyer Classic Award redemption tickets will rise by $4 for domestic travel (up from $12 to $16) and by $10 for Trans-Tasman flights (from $20 to $30).

From April 12, international travel will attract a higher fuel surcharge on top of the ticketed cost.

The fuel surcharge component for a one-way fare to Asia will rise by $10 to $175, while trips to the USA, London and Frankfurt will go up by $30 (giving USA travel a total fuel surcharge of $340 each way, with $380 for Europe).

The move comes just eight weeks since Qantas last raised its fuel surcharge on February 2.

"Jet fuel is Qantas' largest operational cost" the airline said in a statement "and market prices remain consistently high. Average year-to-date fuel prices are at their highest level since 2007/08."