Informational Guide to San Francisco Airport (SFO) - NON OFFICIAL

UA1023 United Airlines - Flight Status

Codeshare Flights
The flight AC4047 from Air Canada (AC) is a codeshare flight operated by United Airlines (UA) under the flight number UA1023. Check this page for details about flight UA1023.

Below, you can find details about United Airlines flight UA1023, which currently operates between the airports of San Francisco - San Francisco International Airport (Airport Code SFO) and Denver - Denver International Airport (Airport Code DEN).
This flight data pertains specifically to the flight's details for Sunday, March 22, 2026.

UA1023 On Time performance:
78
We have calculated the percentage of flights that arrived within 15 minutes of their scheduled time, or earlier, based on real flight data from the last 3 months. More about punctuality and delays

Flight Status

UA1023 United Airlines to Denver

Scheduled - On-time
Flight Status for Sunday March 22, 2026
This flight was also scheduled for Yesterday (March 20, 2026). See it here
This flight is also scheduled for Today (March 21, 2026). See it here

Airline information

United Airlines
United Airlines
Equipment: Boeing 757-300 (winglets) Passenger

Departure

San Francisco (SFO)
March 22, 2026
San Francisco International Airport
Estimated Departure Time:
08:45 am
Terminal:
3
Gate:
F19
Scheduled Departure Time: 08:45 am

Arrival

Denver (DEN)
March 22, 2026
Denver International Airport
Estimated Arrival Time:
12:28 pm
Terminal:
-
Gate:
-
Scheduled Arrival Time: 12:28 pm
Disclaimer
The information displayed on this website is gathered from third-party providers with a wide reputation on the sector, which in turn obtain the information from the airlines. This data is provided only for informative purposes. www.airport-sfo.com assumes no responsibility for loss or damage as a result of relying on information posted here. Please contact your airline to verify flight status.

Codeshare Flights

This flight is shared with other airlines, this means that these other flights are the same:

- AC4047 - Air Canada

- NZ9058 - Air New Zealand

- VA8342 - Virgin Australia

Additional Information

Which is the frequency of flight UA1023?
The flight UA1023 is scheduled to flight on daily basis.

Which is the distance of flight UA1023?
The distance between the two airports is 966 miles.

Which is the flight time of flight UA1023?
The scheduled flight time gate to gate is: 02:43 hours.
The real flight time gate to gate on average is: 02:42 hours.

Are the departure airport and arrival airport at the same Time Zone?
No, each airport is in a different timezone. The times shown above, are presented in the local time of each respective airport.
Current Time in San Francisco: 2026-03-21 08:03:27
Current Time in Denver: 2026-03-21 09:03:27

Alternative Flights

The following airlines serves the same route between San Francisco and Denver:

Frontier Airlines
- Flight Number: F91094. (On Time performance: 65 - Average Delay: 31 minutes)
- Flight Number: F91230. (On Time performance: 89 - Average Delay: 7 minutes)
- Flight Number: F93440. (On Time performance: 87 - Average Delay: 10 minutes)

United Airlines
- Flight Number: UA1430. (On Time performance: 83 - Average Delay: 13 minutes)
- Flight Number: UA1479. (On Time performance: 67 - Average Delay: 10 minutes)
- Flight Number: UA1596. (On Time performance: 72 - Average Delay: 17 minutes)
- Flight Number: UA1604. (On Time performance: 67 - Average Delay: 25 minutes)
- Flight Number: UA2076. (On Time performance: 78 - Average Delay: 15 minutes)
- Flight Number: UA2302. (On Time performance: 95 - Average Delay: 9 minutes)
- Flight Number: UA2348. (On Time performance: 88 - Average Delay: 5 minutes)
- Flight Number: UA2420. (On Time performance: 96 - Average Delay: -1 minutes)
- Flight Number: UA2436. (On Time performance: 88 - Average Delay: 9 minutes)
- Flight Number: UA259. (On Time performance: 78 - Average Delay: 21 minutes)
- Flight Number: UA301. (On Time performance: 83 - Average Delay: 7 minutes)
- Flight Number: UA450. (On Time performance: 85 - Average Delay: 12 minutes)
- Flight Number: UA513. (On Time performance: 89 - Average Delay: 4 minutes)

Southwest Airlines
- Flight Number: WN1228. (On Time performance: 84 - Average Delay: 12 minutes)
- Flight Number: WN2477. (On Time performance: 100 - Average Delay: 1 minutes)
- Flight Number: WN276.
- Flight Number: WN310. (On Time performance: 83 - Average Delay: 7 minutes)
- Flight Number: WN4257. (On Time performance: 64 - Average Delay: 18 minutes)
- Flight Number: WN4429. (On Time performance: 33 - Average Delay: 40 minutes)
- Flight Number: WN4430. (On Time performance: 44 - Average Delay: 26 minutes)
- Flight Number: WN4498. (On Time performance: 88 - Average Delay: 8 minutes)
- Flight Number: WN4499. (On Time performance: 71 - Average Delay: 21 minutes)
- Flight Number: WN860. (On Time performance: 67 - Average Delay: 10 minutes)

Punctuality and delays

We have gathered data from recent months and present below an analysis of how timely the flights have been.

In terms of On-Time Performance, by analyzing the flight data from the last three months, spanning from March 05, 2026 to March 13, 2026, we have obtained these figures.
Total number of flights: 9
On Time: 7 ( 78 % )
Moderate Delay: 0 ( 0 % )
Significant Delay: 1 ( 11 % )
Major Delay: 1 ( 11 % )
Canceled: 0 ( 0 % )
Diverted: 0 ( 0 % )

Average Delay: 18 minutes.
Delays analyzed by Week: It is not possible to calculate the On-Time Performance for this flight accurately by weekday due to insufficient or non-representative data, as doing so could lead to misleading conclusions
Delays analyzed by Month: It is not possible to calculate the On-Time Performance for this flight accurately by month due to insufficient or non-representative data, as doing so could lead to misleading conclusions

Last Past Flights UA1023

Date
Departure
Arrival
Duration
Aircraft
Status
Friday
20 March
08:37 am
San Francisco (SFO)
12:13 pm
Denver (DEN)
02h 36min
Boeing 757-300
Boeing 757-300
Landed - On-time
Thursday
19 March
08:50 am
San Francisco (SFO)
12:34 pm
Denver (DEN)
02h 44min
Boeing 757-300
Boeing 757-300
Landed - On-time
Wednesday
18 March
10:52 am
()
02:23 pm
Denver (DEN)
Boeing 757-300
Boeing 757-300
Landed - DIVERTED
Wednesday
18 March
08:55 am
San Francisco (SFO)
10:47 am
San Francisco (SFO)
Boeing 757-300
Boeing 757-300
- DIVERTED
Tuesday
17 March
08:42 am
San Francisco (SFO)
12:24 pm
Denver (DEN)
Boeing 757-300
Boeing 757-300
Landed - On-time
Monday
16 March
08:47 am
San Francisco (SFO)
12:25 pm
Denver (DEN)
Boeing 757-300
Boeing 757-300
Landed - On-time
Sunday
15 March
08:42 am
San Francisco (SFO)
12:23 pm
Denver (DEN)
Boeing 757-300
Boeing 757-300
Landed - On-time
Saturday
14 March
08:43 am
San Francisco (SFO)
12:14 pm
Denver (DEN)
Boeing 757-300
Boeing 757-300
Landed - On-time
Friday
13 March
11:02 am
San Francisco (SFO)
02:22 pm
Denver (DEN)
Boeing 757-300
Boeing 757-300
Landed - Delayed
Thursday
12 March
08:41 am
San Francisco (SFO)
01:02 pm
Denver (DEN)
Boeing 757-300
Boeing 757-300
Landed - Delayed