Air Canada Flight BA857 Deals & Information (2025/2026)

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Air Canada Flight 857 Route Deals From $1,298

The cheapest prices found with in the last 7 days for return flights were $439 and $1,298 for one-way flights to Pearson Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Mar 7 - Sun, Mar 16
LHR
Heathrow
YYZ
Pearson Intl.
$439 Roundtrip, found 3 days ago
$439
Roundtrip
found 3 days ago
Select Air Canada flight, departing Fri, Mar 7 from Heathrow to Pearson Intl., returning Sun, Mar 16, priced at $439 found 3 days ago
Mon, Mar 3 - Tue, Mar 18
LHR
Heathrow
YYZ
Pearson Intl.
$447 Roundtrip, found 6 hours ago
$447
Roundtrip
found 6 hours ago
Select Air Canada flight, departing Mon, Mar 3 from Heathrow to Pearson Intl., returning Tue, Mar 18, priced at $447 found 6 hours ago

Frequently asked questions

What route does flight number AC857 take?
AC857 takes about 7 hours and 40 minutes to jet directly from London Airport (LHR-Heathrow) to YYZ. We all know there’s magic in the destination, but getting there is half the fun!
How often is AC857 on time?
Roughly 94% of AC857 flights leave on time — so if you’re jetting from LHR to YYZ, you can kick back knowing that you’ll touch down at your destination as quickly as possible. If this Air Canada flight encounters a delay, you’re likely to wait around 8 minutes. Due to the airline’s quality service, this route has a star rating of 4.05.
What terminal does AC857 fly out of?
You’ll likely be hopping on the plane at Terminal 2 if you’re traveling on flight number AC857 direct from London Airport (LHR-Heathrow) to Pearson Intl. Airport (YYZ).
What kind of plane is on flight number AC857?
Chances are you’ll find yourself on the Boeing 787-9 if you’re on flight AC857. This flight nearly always jets off from Heathrow Airport (LHR) and arrives at Toronton Pearson.
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 AC857 flight with Travelocity, please visit our Customer Service Portal.