Buyers who travel a lot ask about airport access constantly, and the honest answer depends entirely on which airport and which specific transit option you use. Here's the real breakdown, not a rough map estimate.
Billy Bishop is closer than people expect
The city airport sits at the foot of Bathurst Street, and from the Harbourfront, getting there is genuinely fast. A free shuttle bus runs between Union Station and the airport's mainland terminal every 15 minutes. Once you're at the mainland pavilion, a pedestrian tunnel with moving walkways gets you across to the island terminal in about six minutes, or you can take the free 90-second ferry instead. From Union Station to airport check-in, door to gate can realistically be under 20 minutes on a good day. Airlines still recommend arriving 90 minutes before departure, but the geography itself is about as convenient as city air travel gets anywhere in North America.
Walking is a real option, not just a novelty
It's roughly a 2.5 kilometre walk from Union Station to Billy Bishop, about 10 to 15 minutes, much of it along the waterfront with Toronto Island views. For buyers in the western buildings on this stretch of the Quay, it's genuinely walkable on a nice day with a carry-on.
Pearson is a different story
The UP Express train connects Union Station to Pearson in about 25 minutes, running every 20 minutes or so. That sounds fast on its own, but the full trip from a Harbourfront building includes getting to Union Station first, waiting for the train, and then navigating the terminal once you land at Pearson. Realistically, budget closer to an hour door to check-in once you account for all of it, not the 25 minutes the train itself takes.
What this actually means when you're choosing a unit
If you fly Porter or Air Canada regionally out of Billy Bishop often, proximity to Union Station and the western end of the Quay is worth real weight in your search. If most of your travel routes through Pearson on larger carriers, the difference between buildings on this stretch matters much less, since you're taking UP Express regardless of which specific building you're in.
Worth mentioning during a tour if travel frequency matters to you. It's a genuine factor in choosing between buildings here, not just a nice-to-have line in a listing description.