Flight DL1623
Delta Air Lines flight DL1623
Looking for DL1623 in the air…
Salt Lake City (SLC) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 15% of the time, and when it is late the delay averages 75 minutes. It was cancelled 0.6% of the time.
- On-time arrivals
- 85.3%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 75 min
- Flights arriving 15+ minutes late
- Flights tracked
- 359
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 52%
- Air traffic control & airport 33%
- Late-arriving aircraft 14%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Denver (DEN) to Salt Lake City (SLC)
Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 81 minutes. It was cancelled 0.7% of the time.
- On-time arrivals
- 81.4%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 81 min
- Flights arriving 15+ minutes late
- Flights tracked
- 271
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 62%
- Airline (crew, maintenance, cleaning) 19%
- Air traffic control & airport 15%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.2% | 57 |
| October 2025 | 85.7% | 56 |
| November 2025 | 86.8% | 55 |
| December 2025 | 88.0% | 50 |
| January 2026 | 93.1% | 29 |
| February 2026 | 86.0% | 45 |
| March 2026 | 83.9% | 62 |
| April 2026 | 78.6% | 42 |
| May 2026 | 100.0% | 56 |
| June 2026 | 84.2% | 57 |
| July 2026 | 69.5% | 61 |
| August 2026 | 62.7% | 60 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data