It is not yet known what time the outage occurred, but travellers were tweeting about the delays caused by the outage just before noon.
The airline experienced problems with its computerized systems this morning, meaning passengers were not able to check in or drop off their luggage.
A nationwide network outage at Air Canada led to a flight cancellation and delays at Victoria's airport, officials say.
Passengers are reporting long lines at the airport and it appears some flights are grounded until further notice.
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Michael Badejo, spokesperson with the Winnipeg Airports Authority, said four flights have been delayed, affecting about 200 people.
He said Air Canada contacted the airport at 10 a.m.to say the problem stemmed from an IT issue. Reports are coming in from travellers worldwide, saying their Air Canada planes have been grounded.
"We apologize for any inconvenience and are working towards restoring our service as quickly as possible", the airline said on Twitter.
According to the airlines' website it is also impossible for people to book a flight right now, so if you were hoping to find some last minute deal with Air Canada you're out of luck.