Effortless transfers at South Keys
Watch this short, engaging video to easily transfer between Line 2 and Line 4 at South Keys Station.
Line 4
Line 4 is a 4-kilometre rail service that connects with Line 2 at South Keys Station and provides service to Uplands Station and Airport Station, located directly at the Departures level of Ottawa International Airport.
Hours of operation
Monday - Friday: 6 am - midnight
Saturday: 6:30 am - midnight
Sunday: 7:30 am - 11:30 pm
Service frequency
Monday - Friday: Approximately every 12 minutes
Saturday: Approximately every 12 minutes
Sunday: Approximately every 12 minutes
Service frequency is subject to change.
Line 4Line 4 routing
: Accessible station
The O-Train network is designed to be accessible.
Line 4 route map from South Keys to Airport Station.
Key destinations along Line Line 4
Uplands Station
South Keys Station
Alternative bus services
When the O-Train is not running, alternative bus service will operate instead to connect customers from station to station.
Night service
When O-Train Line 4 closes overnight, alternate bus routes provide rapid service between the stations and into neighbourhoods across the city.
Night service information
Replacement service
When the O-Train Line 4 is not running during regular hours, R4 bus service may operate. R4 buses serve all Line 4 stations and only make limited stops along the way.
R4 service information