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 4128 datapoints.)
The best day to arrive at Kuala Lumpur is Sunday and it would be best to avoid Monday, as prices are on average 57.72% higher than on Sunday. (Average prices, based on 1904 datapoints.)
The cheapest airline flying from Kuala Lumpur to Penang is AirAsia. They are 28% cheaper than MasWings. (Average prices, based on 4170 datapoints.)
The best time to fly is at around 8. (Average prices, based on 8507 datapoints.)