Please be aware that Kuala Lumpur has multiple airports and that these results are for all airports serving the city.
The best month to fly between Kuala Lumpur and Penang is February and the most expensive month to fly is April. (Average prices, based on 1787 datapoints.)
The best day to arrive at Kuala Lumpur is Tuesday and it would be best to avoid Friday, as prices are on average 56.87% higher than on Tuesday. (Average prices, based on 4397 datapoints.)
The cheapest airline flying from Kuala Lumpur to Penang is AirAsia. They are 22% cheaper than FireFly. (Average prices, based on 1811 datapoints.)
The best time to fly is at around 8. (Average prices, based on 5590 datapoints.)