Flight DL1239
Delta Air Lines flight DL1239
Looking for DL1239 in the air…
Seattle (SEA) to Salt Lake City (SLC)
Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 60 minutes. It was cancelled 0.4% of the time.
- On-time arrivals
- 81.2%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 256
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 58%
- Late-arriving aircraft 34%
- Air traffic control & airport 7%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
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Headlines found by Google News; stories open on the publisher's site.
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.7% | 12 |
| October 2025 | 100.0% | 15 |
| November 2025 | 92.9% | 14 |
| December 2025 | 76.2% | 21 |
| January 2026 | 80.6% | 31 |
| February 2026 | 87.5% | 24 |
| March 2026 | 92.3% | 27 |
| April 2026 | 76.9% | 26 |
| May 2026 | 69.2% | 26 |
| June 2026 | 68.4% | 19 |
| July 2026 | 70.8% | 24 |
| August 2026 | 82.4% | 17 |
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