Route
BOS → IAD
Boston Logan International Airport Washington Dulles International Airport
412 miles
Return route IAD → BOS →
How punctual is this route?
- On-time arrivals
- 83.2%
- Less than 15 minutes late
- Cancelled
- 3.0%
- Of scheduled flights
- Average delay when late
- 90 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,527
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Air traffic control & airport 36%
- Airline (crew, maintenance, cleaning) 17%
- Extreme weather 2%
- 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 | 81.6% | 143 |
| October 2025 | 73.2% | 124 |
| November 2025 | 87.2% | 119 |
| December 2025 | 83.6% | 122 |
| January 2026 | 85.4% | 112 |
| February 2026 | 88.5% | 104 |
| March 2026 | 87.9% | 119 |
| April 2026 | 87.5% | 120 |
| May 2026 | 89.3% | 124 |
| June 2026 | 83.1% | 120 |
| July 2026 | 79.1% | 176 |
| August 2026 | 76.3% | 144 |
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 | 1,450 | 83.3% | 2.3% | 84 min |
| Republic Airways | 77 | 79.7% | 16.9% | 212 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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