UA423 — flight status & live tracker

Track UA423 in real time on the ScanFlyGo live map. If the aircraft is airborne and within coverage, you’ll see its exact position, altitude, speed and heading along the Toronto–Denver route.

✈️ Track UA423 on the live map

Route

UA423 is operated by United Airlines and flies from Lester B. Pearson International Airport (YYZ/CYYZ) to Denver International Airport (DEN/KDEN). Compare fares on this route →

The aircraft most recently seen operating UA423 was a Boeing 787-10 Dreamliner (ICAO type code B78X). Equipment changes by season and demand, so the type shown on the live map is the one that counts today.

Keep exploring

• Live traffic at Lester B. Pearson International Airport (YYZ)
• Live traffic at Denver International Airport (DEN)
• Track all United Airlines flights
• Toronto → Denver fare calendar

Frequently asked questions

How do I track flight UA423 live?

Open the ScanFlyGo live map for UA423 to see its current position, altitude and speed in real time. If the flight is airborne and within ADS-B coverage it appears on the map on the Toronto–Denver route.

What route does UA423 fly?

UA423 (United Airlines) operates Toronto (YYZ/CYYZ) to Denver (DEN/KDEN).

What aircraft operates UA423?

UA423 was most recently observed being flown by a Boeing 787-10 Dreamliner (ICAO type B78X). Airlines swap equipment by season and demand, so open the live map to see the exact aircraft — including its registration — operating today.

Is flight UA423 on time?

ScanFlyGo shows live aircraft position rather than airline schedule data. For exact departure and arrival times and delays, check the airline’s website — but the live map tells you instantly whether UA423 is already in the air and where it is.

Is tracking UA423 free?

Yes — ScanFlyGo flight tracking is free with no app or account, on desktop and mobile.

Positions come from community ADS-B networks for information and entertainment only — not for navigation. Coverage may be incomplete or delayed.