First, there is no international terminal at DEN. There is one major terminal for check-ins and baggage claim, and then three concourses of gates. AC uses the "A" Gates, while your arriving one maybe at other ones - just take the terminal train from "B" or "C" into "A" and go to your gate.

Your bags should be checked through to your final destination in Canada, if all your flights are on the same itinerary; or unless you're flying a low-cost airline.

Next time, please state where you're flying from and to, on what airline. And whether on same reservations or separate. Those are important details.

Thank you rkkwan. We are flying Memphis, Denver, Vancouver all on same reservation with United. I looked at airport map and am now thinking with arrival and departure in United terminal and if flight is on time we should make the connection.

Need more info. Your information makes little sense. Denver does have immigrations and customs so need to where you are coming from and they could, potential, prescreen for Canada as the US does in Canada.

Was typing while you were posting. That is not an international flight. Just a connection within the same terminal. Will not make any difference if luggage is checked or not.

You should have no trouble making the connection if your flight from Memphis is on time.

Many thanks to all. Interesting to know flight from Denver to Canada is not considered an international flight.

First, I don't know how I even read Air Canada in the first place. Most UA flights use "B" gates, so there is no train ride needed.

Second, a flight to Canada is of course an international flight, but because the US is one of few countries in the world that does not have passport control for travelers leaving the country, a flight leaving the US is no different from a domestic flight - no passport control, no extra security. And at most airports, airlines just use regular gates for their international departure.

Doesn't matter if you're flying Denver to Vancouver or Chicago to Beijing. Same thing.