Originally Posted by
Viajero Joven
No experience with the KLM bus.....
..... but I can tell you that the YUL Airport Rail station is virtually within walking distance of the YUL terminal- a free shuttle bus loops through every 15 min. or so. You may find it cheaper to just pay your own VIA rail ticket and originate the KLM ticket from YUL.
From what I was told a few years ago you can book YOW-originating KLM tickets for the same price as the flight from YUL - in other words, the bus ride is free. I haven't been able to verify this because you can't book the YOW shuttle at all from Europe for some strange reason - the times I have used it I have always paid the driver, and the fare was all of CAD 15 one-way, which is cheaper than the train (and much less messing-around!)