Air Canada· Callsign ACA856 ·Daily

AC856 from Toronto to London, tracked live

Air Canada's flagship transatlantic service on Canada's single busiest international long-haul corridor.

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Status on this page means observed ADS-B activity inside available receiver coverage. Confirm official delay, cancellation, gate and booking status with Air Canada.

YYZ
Toronto
Toronto Pearson International Airport
20:45 EDT (UTC-4)
7h 00m
5,707 km · 3,546 mi
Non-stop
LHR
London
London Heathrow Airport
08:45 GMT (UTC+0)
Typical schedule · next departure Thursday, October 29 · times shown in airport local time
Aircraft
Boeing 777-300ER
typical equipment
Distance
5,707 km
3,082 nautical miles
Heading
52°
tracks north-east
Clock change
+4 h
on arrival
Block speed
815 km/h
gate to gate average
Range used
42%
of the type's book range
Length rank
#203
of 439 tracked routes

Follow AC856 in real time

The aircraft appears below whenever it is airborne and inside receiver coverage. Its planned route is drawn between the two airports.

AC856 is not transmitting right now. It may be between rotations, on the ground, or out of receiver range - Check back near 20:45 at YYZ. The full map has the rest of the sky, and what is flying over me will name whatever is above you instead.

AC856 at a glance

  • The trip: 5,707 km (3,546 miles) from Toronto to London, flying north-east.
  • How long: 7h 00m gate to gate. That is about 815 km/h on average, taxi time included.
  • Your watch: set it 4 hours forward on arrival.
  • Window seat tip: the right (south-facing) side gets the sun on a daytime flight.
  • The plane: usually a Boeing 777-300ER. This route uses about 42% of how far it can fly.
  • When it goes: out of YYZ in late evening, into LHR in early morning. It is an overnight, so most of the cabin will try to sleep.

AC856 route overview: YYZ to LHR

AC856 distance and great-circle path

AC856 covers 5,707 km, or 3,546 miles. That makes it a long-haul flight, a widebody route with a full night's flying time. Of the 439 routes we track, it ranks 203 by distance.

The plane leaves Toronto heading north-east. On the map above, the line looks curved. That is normal. The shortest path over a round planet never looks straight on a flat screen. Our guide explains how the YYZ-LHR route appears on a tracker map.

Why AC856 block time differs from cruise time

The schedule allows 7.0 hours from gate to gate. That works out to about 815 km/h. A Boeing 777-300ER cruises faster than that. The gap is taxi time, climbing, descending and holding.

Flying east, this route usually picks up tailwinds high up. The flight back west normally takes longer, even though the distance is identical. See how timing changes the trip in our red-eye flight guide.

Can the Boeing 777-300ER comfortably fly AC856?

Not at all. At roughly 42% of its range, this is an easy trip for a Boeing 777-300ER. The airline picked it for cabin size, not distance. The full numbers are on our aircraft page for the Boeing 777-300ER.

What to know about AC856

  • Time change: you land 4 hours ahead of the time you left.

AC856 activity in the past 7 days

Our database contains 6 observations of AC856 across 6 UTC dates in this window, most recently 2026-10-29. Those records contain 4 distinct transponder addresses. The most frequently resolved route was YYZ-LHR (6 records).

The median recorded visibility was 413 minutes. That is time inside receiver coverage, not airborne duration or an on-time-performance measurement.

Date (UTC)RouteFirst trackedLast trackedTracked for
2026-10-29 YYZ → LHR 01:14 UTC 08:18 UTC 7h 3m
2026-10-28 YYZ → LHR 02:24 UTC 09:41 UTC 7h 17m
2026-10-27 YYZ → LHR 01:06 UTC 07:52 UTC 6h 46m
2026-10-26 YYZ → LHR 01:37 UTC 08:36 UTC 6h 59m
2026-10-24 YYZ → LHR 00:28 UTC 07:10 UTC 6h 42m
2026-10-23 YYZ → LHR 00:35 UTC 07:02 UTC 6h 27m

“First/last tracked” are when AC856 entered and left receiver coverage, in UTC.

Airports and aircraft on AC856

Every scheduled service we follow is listed in the tracker directory, including Air Canada and other tracked flights grouped by airline.

YYZ Toronto Pearson International Airport Toronto, Canada · live radar →
LHR London Heathrow Airport London, United Kingdom · live radar →
B77W Boeing 777-300ER Typical equipment · specs →

How much CO2 does AC856 emit?

Worked from the great-circle distance and the fuel burn measured for Boeing 777-300ER, the aircraft normally flying this route. Carbon dioxide only - see the method below.

Distance flown5,707 km
AircraftBoeing 777-300ER
Fuel burn rate8.86 kg per km
Fuel burned50,558 kg
CO2, whole flight159.8 tonnes
Seats, typical layout365
Passengers carried303 at an 83% load factor
CO2 per passenger527 kg

Where that lands by cabin

The aircraft burns the same fuel whoever is aboard, so the cabins divide one total rather than each carrying their own. A seat's share is the floor it takes up, which is why an economy seat comes out below the 527 kg cabin average and a flat bed well above it.

Economy299 seats, 248 flown
383 kg CO2 per seat
Business55 seats, 46 flown
1,110 kg CO2 per seat
First11 seats, 9 flown
1,531 kg CO2 per seat

Taken whole, AC856 emits what 2,663 trees take back out of the air in a year. One economy seat on it accounts for about the same carbon dioxide as driving a petrol car 3,102 km, or 15,065 km of the same journey by train.

How this is worked out. Fuel burn is read from published measurements of this type, taken at sectors of 10,199 km, 11,112 km and 13,334 km, all longer than this route, so the closest is held flat and the real figure is likely a little higher. It counts carbon dioxide only, and the cabin split assumes the layout typical of this size of aircraft. Read the full method, sources and caveats, or put AC856 against another flight.

Other tracked flights from Toronto

FlightRouteTypical aircraft
AC900Toronto (YYZ) → Fort Lauderdale (FLL) Boeing 787-9 DreamlinerAC900 flight tracker →
SV61Jeddah (JED) → Toronto (YYZ) Boeing 787-9 DreamlinerSV61 flight tracker →
AC725New York (LGA) → Toronto (YYZ) Twin Squirrel AS.355 F1AC725 flight tracker →
AC827Brussels (BRU) → Toronto (YYZ) Boeing 787-9 DreamlinerAC827 flight tracker →
AC114Vancouver (YVR) → Toronto (YYZ) Boeing 787-9 DreamlinerAC114 flight tracker →
AC121Toronto (YYZ) → Vancouver (YVR) Boeing 787-9 DreamlinerAC121 flight tracker →

Guides relevant to AC856

Chosen from this route's distance, timing, aircraft, airline and airports.

Red-eye flights explained This schedule runs overnight, so cabin timing and sleep strategy matter.
The science of jet lag Arrival shifts the clock by 4 hours.
Narrowbody vs widebody aircraft A long-haul sector makes aircraft size, cabin layout and range especially relevant.

Data sources and review

Reviewed 2026-07-29 by Flight-Tracker.net Editorial Team

The route and typical schedule are maintained reference data. Live ADS-B observations are evidence of receiver coverage, not proof of on-time performance. Always confirm the operating date and times with the airline.

Read our schedule and observation review process, or inspect the machine-readable reference dataset.

Put AC856 on your own site

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AC856 frequently asked questions

How long is the AC856 flight?

Toronto to London is 5,707 km (3,546 miles) in a straight line, scheduled at 7.0 hours gate to gate. Actual airborne time varies with winds, routing and holding.

What aircraft operates AC856?

Typically a Boeing 777-300ER (full specifications), using roughly 42% of that type's published range.

Does AC856 fly every day?

The published pattern is daily, departing 20:45 local from YYZ. Always confirm with the airline before travelling.

Can I track AC856 live?

Yes. Whenever AC856 is airborne and in receiver coverage the map above follows it live, with altitude, ground speed and heading. Between rotations, the seven-day log above shows where it has been.

More Air Canada flights to watch

FlightRouteTypical aircraft
AC900 Toronto (YYZ) → Fort Lauderdale (FLL) Boeing 787-9 Dreamliner AC900 flight tracker →
AC846 Montreal (YUL) → Frankfurt (FRA) Boeing 787-8 Dreamliner AC846 flight tracker →
AC2401 Paris (CDG) → Montreal (YUL) AC2401 flight tracker →
AC35 Vancouver (YVR) → Brisbane (BNE) Boeing 787-9 Dreamliner AC35 flight tracker →
AC7 Seoul (ICN) → Hong Kong (HKG) Boeing 787-9 Dreamliner AC7 flight tracker →
AC65 Vancouver (YVR) → Bangkok (BKK) Boeing 787-9 Dreamliner AC65 flight tracker →
AC725 New York (LGA) → Toronto (YYZ) Twin Squirrel AS.355 F1 AC725 flight tracker →
AC827 Brussels (BRU) → Toronto (YYZ) Boeing 787-9 Dreamliner AC827 flight tracker →
AC114 Vancouver (YVR) → Toronto (YYZ) Boeing 787-9 Dreamliner AC114 flight tracker →
AC121 Toronto (YYZ) → Vancouver (YVR) Boeing 787-9 Dreamliner AC121 flight tracker →
AC844 Montreal (YUL) → Frankfurt (FRA) Airbus A330-300 AC844 flight tracker →
AC1070 Dallas - Fort Worth (DFW) → Montreal (YUL) Airbus A220-300 AC1070 flight tracker →
AC33 Vancouver (YVR) → Sydney (SYD) Boeing 787-9 AC33 flight tracker →
AC42 Toronto (YYZ) → Delhi (DEL) Boeing 777-300ER AC42 flight tracker →
AC870 Montreal (YUL) → Paris (CDG) Boeing 777-300ER AC870 flight tracker →
AC3 Toronto (YYZ) → Tokyo (HND) Boeing 787-9 AC3 flight tracker →