The proportion of low-cost carrier Jetstar's revenue derived from fees for everything from checking a bag to buying a meal rather than the ticket price itself is on the rise.

A new report on so-called "ancillary revenue" from US consultancy IdeaWorks Company found Jetstar - including its overseas arms - received 20.6 per cent of its revenue from such fees in 2013, up from 18.6 per cent in 2012 and 15.3 per cent in 2011.

Ordering food? Just one of many additional purchases that make up a sizable slab of Jetstar's revenue.

The airline extracted $31.60 per passenger in ancillary revenue in 2013, up from $30.60 in 2012 and $24.10 in 2011.

The low-cost carrier model is built on offering low headline fares to passengers and then convincing them to pay for extras like checked bags, seat selection, food, entertainment and other services.