Route
IAD → BNA
Washington Dulles International Airport Nashville International Airport
542 miles
Return route BNA → IAD →
How punctual is this route?
- On-time arrivals
- 81.0%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 84 min
- Flights arriving 15+ minutes late
- Flights tracked
- 998
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Air traffic control & airport 25%
- Airline (crew, maintenance, cleaning) 22%
- Extreme weather 9%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.1% | 79 |
| October 2025 | 82.8% | 93 |
| November 2025 | 80.7% | 88 |
| December 2025 | 74.3% | 71 |
| January 2026 | 87.0% | 58 |
| February 2026 | 84.8% | 68 |
| March 2026 | 86.2% | 87 |
| April 2026 | 93.3% | 89 |
| May 2026 | 79.1% | 86 |
| June 2026 | 72.8% | 92 |
| July 2026 | 69.5% | 98 |
| August 2026 | 74.2% | 89 |
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
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 927 | 81.3% | 0.8% | 84 min |
| Republic Airways | 38 | 89.2% | 0.0% | 59 min |
| Allegiant Air | 32 | 61.3% | 3.1% | 95 min |
| Southwest Airlines | 1 | 100.0% | 0.0% | — |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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