If you are planning a holiday during the upcoming festival season that starts in late September with Durga Puja and ends with Diwali on October 19, chances are that you will have to shell out more for air travel. This is because airlines have hiked fares by between 30% and 80% on the country's six busiest routes \u2014 comprising 70-75% of total passengers flown in a month \u2014 compared with what it was during the festive season last year. According to data made available by online ticket and travel booking platform Ixigo, the average airfares on the metro routes and in the top 10 sectors have seen double-digit increases, which is the highest in recent years. The increased fare will kick in if you book tickets today for travel between September 20 to October 20.\u00a0Since jet fuel prices, which comprise around 40% of the total operating costs of airlines, are lower right now by around 11% than what it was in January, analysts termed this hike in fares as routine because airlines generally raise fares at this point of time. Once the festive season is over come the discount sales by most carriers. \u00a0Average fares on the Delhi-Mumbai route (one-way) \u2014 the busiest in the domestic sector \u2014 have seen an increase of a whopping 55% year-on-year to Rs 4,539 per trip from Rs 2,923 during the same period last year. Similarly, ticket prices on the Delhi-Bengaluru route have seen an increase of 12% year-on-year to Rs 5,006 while the same on the another popular route, Delhi-Chennai, saw an increase of 23% year-on-year to Rs 5,881. Ticket prices from another important hub, Mumbai, has also witnessed a sharp jump with fares on the Mumbai-Bengaluru route increasing by 36% year-on-year to Rs 4,034 while the steepest rise has been on the Mumbai-Hyderabad route which has seen an increase of 88% year-on-year to Rs 4,575 per trip. Other prominent routes like Mumbai-Kolkata and Chennai-Goa have seen an increase of more than 35% year-on-year.