Flight DL1223
Delta Air Lines flight DL1223
Looking for DL1223 in the air…
Atlanta (ATL) to Houston (IAH)
Historically, this flight arrives 15+ minutes late 31% of the time, and when it is late the delay averages 74 minutes. It was cancelled 2.2% of the time.
- On-time arrivals
- 68.5%
- Less than 15 minutes late
- Cancelled
- 2.2%
- Of scheduled flights
- Average delay when late
- 74 min
- Flights arriving 15+ minutes late
- Flights tracked
- 183
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 35%
- Air traffic control & airport 27%
- Late-arriving aircraft 25%
- Extreme weather 13%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Houston (IAH) to Atlanta (ATL)
Historically, this flight arrives 15+ minutes late 28% of the time, and when it is late the delay averages 109 minutes. It was cancelled 3.1% of the time.
- On-time arrivals
- 71.8%
- Less than 15 minutes late
- Cancelled
- 3.1%
- Of scheduled flights
- Average delay when late
- 109 min
- Flights arriving 15+ minutes late
- Flights tracked
- 161
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 48%
- Airline (crew, maintenance, cleaning) 37%
- Air traffic control & airport 15%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Fort Myers (RSW) to Boston (BOS)
Historically, this flight arrives 15+ minutes late 28% of the time, and when it is late the delay averages 103 minutes. It was cancelled 0.9% of the time.
- On-time arrivals
- 72.5%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 103 min
- Flights arriving 15+ minutes late
- Flights tracked
- 110
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 41%
- Air traffic control & airport 37%
- Late-arriving aircraft 22%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Seattle (SEA) to Spokane (GEG)
Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 75 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 80.6%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 75 min
- Flights arriving 15+ minutes late
- Flights tracked
- 36
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 38%
- Air traffic control & airport 28%
- Extreme weather 25%
- Airline (crew, maintenance, cleaning) 9%
- 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 | 70.0% | 30 |
| October 2025 | 67.7% | 31 |
| November 2025 | 86.7% | 30 |
| December 2025 | 77.5% | 43 |
| January 2026 | 66.0% | 56 |
| February 2026 | 81.1% | 53 |
| March 2026 | 77.8% | 37 |
| April 2026 | 87.5% | 48 |
| May 2026 | 72.7% | 33 |
| June 2026 | 44.8% | 29 |
| July 2026 | 51.1% | 48 |
| August 2026 | 69.2% | 52 |
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