Flight DL1821
Delta Air Lines flight DL1821
Looking for DL1821 in the air…
Detroit (DTW) to Portland (PWM)
Historically, this flight arrives 15+ minutes late 11% of the time, and when it is late the delay averages 52 minutes. It was cancelled 1.2% of the time.
- On-time arrivals
- 89.3%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 52 min
- Flights arriving 15+ minutes late
- Flights tracked
- 86
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 68%
- Air traffic control & airport 23%
- Late-arriving aircraft 9%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Portland (PWM) to Detroit (DTW)
Historically, this flight arrives 15+ minutes late 25% of the time, and when it is late the delay averages 93 minutes. It was cancelled 1.2% of the time.
- On-time arrivals
- 75.3%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 93 min
- Flights arriving 15+ minutes late
- Flights tracked
- 86
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 36%
- Air traffic control & airport 33%
- Late-arriving aircraft 31%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Atlanta (ATL) to Jackson (JAN)
Historically, this flight arrives 15+ minutes late 18% of the time, and when it is late the delay averages 71 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 81.8%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 71 min
- Flights arriving 15+ minutes late
- Flights tracked
- 22
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 85%
- Late-arriving aircraft 11%
- Air traffic control & airport 4%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Jackson (JAN) to Atlanta (ATL)
Historically, this flight arrives 15+ minutes late 14% of the time, and when it is late the delay averages 61 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 86.4%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 61 min
- Flights arriving 15+ minutes late
- Flights tracked
- 22
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 96%
- Airline (crew, maintenance, cleaning) 4%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Charlotte Amalie (STT) to Atlanta (ATL)
Only 5 flights on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- —
- Flights arriving 15+ minutes late
- Flights tracked
- 5
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 86.1% | 36 |
| October 2025 | 75.0% | 8 |
| November 2025 | 100.0% | 3 |
| December 2025 | 100.0% | 2 |
| June 2026 | 85.4% | 48 |
| July 2026 | 74.6% | 62 |
| August 2026 | 87.1% | 62 |
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