Airfares are heading northwards for the festival season, with the average one-way ticket price on key domestic routes being 10-15 per cent more for Diwali and 20-25 per cent higher for certain flights to Kerala cities for Onam. Airfares are heading northwards for the festival season, with the average one-way ticket price on key domestic routes being 10-15 per cent more for Diwali and 20-25 per cent higher for certain flights to Kerala cities for Onam. Zee News :Business