Ottawa Macdonald-Cartier International Airport

This is a high-quality FBO (a bit nicer than the Esso Avitat next door), but also pricey, with lots of fees and expensive gas. If you're meeting customs, you have to make at least a short stop at the Esso or Shell (your choice), but otherwise, if you don't need the shiny FBO, the Ottawa Flying Club on the north field is a less expensive option for fuel and parking.

The Esso and Shell on the south field are fairly expensive for fuel and have high parking and ramp fees. Esso used to waive the ramp fee when you were meeting customs there, but I don't know if they still do that. If you don't need the full FBO red carpet service (and aren't arriving late in the evening), the Ottawa Flying Club on the north field is a cheaper option for fuel and parking.

OAS is the rival flight school to the Ottawa Flying Club across the ramp. OAS is privately-owned, and uses Katanas instead of Cessnas for training. They offer parking, but I think are not allowed to sell fuel to visitors.

I learned to fly here, and parked my plane here for a few years before moving to Ottawa/Rockcliffe. It's gotten busier recently, now that the club runs the professional pilot program for Algonquin College.

There's also a small Tim's in the main (new) terminal building, for airline passengers and others at the south field.