Flight DL499
Delta Air Lines flight DL499
Looking for DL499 in the air…
Boston (BOS) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 16% of the time, and when it is late the delay averages 62 minutes. It was cancelled 1.4% of the time.
- On-time arrivals
- 83.6%
- Less than 15 minutes late
- Cancelled
- 1.4%
- Of scheduled flights
- Average delay when late
- 62 min
- Flights arriving 15+ minutes late
- Flights tracked
- 365
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 50%
- Air traffic control & airport 39%
- Late-arriving aircraft 11%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Denver (DEN) to Boston (BOS)
Historically, this flight arrives 15+ minutes late 28% of the time, and when it is late the delay averages 67 minutes. It was cancelled 1.1% of the time.
- On-time arrivals
- 71.5%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 349
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 61%
- Late-arriving aircraft 24%
- Airline (crew, maintenance, cleaning) 13%
- Extreme weather 1%
- 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 | 60.0% | 60 |
| October 2025 | 66.1% | 62 |
| November 2025 | 90.0% | 60 |
| December 2025 | 70.0% | 50 |
| January 2026 | 74.5% | 58 |
| February 2026 | 88.7% | 56 |
| March 2026 | 80.6% | 62 |
| April 2026 | 90.0% | 60 |
| May 2026 | 86.7% | 62 |
| June 2026 | 80.0% | 60 |
| July 2026 | 73.3% | 62 |
| August 2026 | 72.6% | 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