Question : How long do most people stay in Ottawa when they fly in from Cincinnati?
Answer : Of course you're not most people, but if you were, you'd stay roughly eight days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : For the month of December, the cheapest day to fly is Wednesday. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : Over the coming months, which airline is getting its passengers to Ottawa/Macdonald-Cartier International Airport (YOW) round-trip the cheapest?
Answer : American Airlines is your best bet for finding that coveted low fare.