The best month to fly between Riyadh and Islamabad is September and the most expensive month to fly is April. (Average prices, based on 1341 datapoints.)
The best day to arrive at Riyadh is Saturday and it would be best to avoid Sunday, as prices are on average 32.2% higher than on Saturday. (Average prices, based on 3724653 datapoints.)
The cheapest airline flying from Riyadh to Islamabad is PIA. They are 54% cheaper than airblue. (Average prices, based on 1347 datapoints.)