2 airports in Montreal

Would anyone happen to know, which airport I will need to use disembarking from HAL in Montreal, Ca.

Would anyone happen to know, which airport I will need to use disembarking from HAL in Montreal, Ca.

Pierre Elliot Trudeau International (formerly known as "Dorval")

Would anyone happen to know, which airport I will need to use disembarking from HAL in Montreal, Ca.

There's only one airport in Montreal with regularly scheduled passenger service:

Montreal Pierre Elliot Trudeau International, formally called Dorval, IATA code is YUL. It's fairly close to downtown.

Yes Montreal has other airports, and there were grand plans to move all passenger service to YMX/Mirabel, but they gave up on that and now YMX is commercial/cargo only. There's also another airport St Hubert, but it's all general aviation.