Flight DL977
Delta Air Lines flight DL977
Looking for DL977 in the air…
Alerts at this flight's airports
Boston (BOS) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 20% of the time, and when it is late the delay averages 64 minutes. It was cancelled 2.1% of the time.
- On-time arrivals
- 80.3%
- Less than 15 minutes late
- Cancelled
- 2.1%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 234
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 58%
- Air traffic control & airport 25%
- Late-arriving aircraft 17%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Boston (BOS)
Historically, this flight arrives 15+ minutes late 43% of the time, and when it is late the delay averages 75 minutes. It was cancelled 1.7% of the time.
- On-time arrivals
- 56.6%
- Less than 15 minutes late
- Cancelled
- 1.7%
- Of scheduled flights
- Average delay when late
- 75 min
- Flights arriving 15+ minutes late
- Flights tracked
- 230
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 34%
- Airline (crew, maintenance, cleaning) 32%
- Late-arriving aircraft 20%
- Extreme weather 14%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Orlando (MCO) to Atlanta (ATL)
Historically, this flight arrives 15+ minutes late 34% of the time, and when it is late the delay averages 71 minutes. It was cancelled 0.9% of the time.
- On-time arrivals
- 65.7%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 71 min
- Flights arriving 15+ minutes late
- Flights tracked
- 109
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 54%
- Air traffic control & airport 26%
- Airline (crew, maintenance, cleaning) 19%
- Extreme weather 2%
- 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 | 76.7% | 30 |
| October 2025 | 48.4% | 31 |
| November 2025 | 69.0% | 29 |
| December 2025 | 62.9% | 36 |
| January 2026 | 72.7% | 47 |
| February 2026 | 77.5% | 44 |
| March 2026 | 79.6% | 54 |
| April 2026 | 61.1% | 56 |
| May 2026 | 74.2% | 62 |
| June 2026 | 63.3% | 60 |
| July 2026 | 64.5% | 62 |
| August 2026 | 64.5% | 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