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 Pekanbaru is October and the most expensive month to fly is February. (Average prices, based on 1692 datapoints.)
The best day to arrive at Kuala Lumpur is Friday and it would be best to avoid Sunday, as prices are on average 99.05% higher than on Friday. (Average prices, based on 625 datapoints.)