In general, when booking your flight to Ottawa, March is the cheapest month on average.
On average, from most locations, when planning your trip to Ottawa, try to book your flight in the region of 29 days in advance for the cheapest prices.
In general, booking your departure to Ottawa for a Wednesday represents the best deal on airfare. Try to avoid a Sunday departure to stay away from the highest prices.
Typically, cheap prices to Ottawa are most often found for evening flights. Cheap prices are less likely for afternoon flights.