Jetstar Airways Pty Ltd, operating as Jetstar, is an Australian low-cost airline headquartered in Melbourne, Victoria. It is a wholly owned subsidiary of Qantas, created in response to the threat posed by the airline Virgin Blue. Jetstar is part of Qantas' two brand strategy of having Qantas Airways for the premium full-service market and Jetstar for the low-cost market. As of 2015, Jetstar carries 8.5% of all passengers travelling in and out of Australia.

A low-cost carrier (LCC) or low-cost airline, also called no-frills, budget or discount carrier or airline, is an airline that is operated with an emphasis on minimizing operating costs. It sacrifices certain traditional airline luxuries, for cheaper fares. To make up for revenue lost in decreased ticket prices, the airline may charge extra fees such as for carry-on baggage. As of April 2020, the world's largest low-cost carrier is Southwest Airlines, which operates primarily in the United States, as well as in some surrounding areas.