Which is the best airport to fly into from Calgary AB to Cortina Italy
Probably Venice VCE
Next would be Milan MXP
Use Google Flights to search
Marco Polo at Venice. Cortina is a two hour bus ride away from Cortina on Cortina Express from the airport parking lot.
Marco Polo in Venice as above. There are no direct flights from Calgary, AFAIK. Your best bet is probably Air Canada/Lufthansa, with a connection in Frankfurt (or Toronto).
I'm not sure what you mean. I assume you've looked at a map and can see the closest international airport so are you asking about connections?