YUL April 2018 numbers.
Total passengers: 1,482,221 +2.3% (April 2017 was up 17% over April 2016)
Domestic: 537,541 +1.1% (+12% last year)
International: 575,898 +1.8% (+25% last year)
Transborder: 368,782 +4.8% (+11.8% last year)
So a modest increase compared to last year, but accounting for last years' tremendous growth in April, the 2 year growth average isn't too bad.
Easter traffic was during March, plus the shitty weather we had in April (freezing rain, canceled flights) can help partly explain the weak numbers.
https://www.admtl.com/sites/default/files/2018/ADM_Statsdet_2018_EN.pdf