Billy Bishop Toronto City Airport (YTZ) is strictly regulated due to its proximity to downtown Toronto and has specific hours of operation. In 2026, the airport terminal typically opens at 5:00 AM daily. However, the first flights generally do not depart until 6:45 AM due to noise curfews. The airport effectively closes at 11:00 PM, which is the "strict" curfew for commercial landings; if a flight is delayed past this time, it is often diverted to Toronto Pearson (YYZ). The pedestrian tunnel connecting the mainland to the island airport is open 24/7, but security screening and airline check-in counters do not begin operating until approximately 5:30 AM. If you are taking the ferry instead of the tunnel, the first ferry crossing usually leaves the mainland dock at 5:15 AM. It is one of the most convenient airports in North America for downtown travelers, but its limited hours are a trade-off for its central location.