Air Canada Flight AC421 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Air Canada Flight 421 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $580 and for one-way flights to Pearson Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jun 23 - Wed, Jun 25
YUL
Pierre Elliott Trudeau Intl.
YYZ
Pearson Intl.
$580 Roundtrip, found 6 days ago
$580
Roundtrip
found 6 days ago
Select Air Canada flight, departing Mon, Jun 23 from Pierre Elliott Trudeau Intl. to Pearson Intl., returning Wed, Jun 25, priced at $580 found 6 days ago

Frequently asked questions

What route does flight number AC421 take?
You'll be landing into Pearson Intl. Airport (YYZ) from Pierre Elliott Trudeau Intl. Airport (YUL) if you're traveling on flight number AC421. You'll be in the air for 1 hour and 22 minutes during this trip. It's also good to note that it conveniently travels direct.
What kind of plane is on flight number AC421?
The route for flight number AC421 is almost always Pierre Elliott Trudeau Intl. Airport (YUL) to Pearson Intl. Airport (YYZ), and the Boeing 737 MAX 8 is the type of aircraft you'll probably be flying with.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your AC421 flight with Travelocity, please visit our Customer Service Portal.