Route
IAD → BOS
Washington Dulles International Airport Boston Logan International Airport
How punctual is this route?
- On-time arrivals
- 76.9%
- Less than 15 minutes late
- Cancelled
- 2.8%
- Of scheduled flights
- Average delay when late
- 74 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,524
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 63%
- Late-arriving aircraft 18%
- Airline (crew, maintenance, cleaning) 15%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 57.9% | 142 |
| October 2025 | 74.0% | 124 |
| November 2025 | 77.8% | 119 |
| December 2025 | 76.2% | 122 |
| January 2026 | 87.5% | 111 |
| February 2026 | 86.3% | 103 |
| March 2026 | 80.3% | 119 |
| April 2026 | 80.8% | 120 |
| May 2026 | 81.3% | 124 |
| June 2026 | 81.2% | 120 |
| July 2026 | 73.8% | 176 |
| August 2026 | 73.6% | 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 | 1,447 | 77.1% | 2.1% | 74 min |
| Republic Airways | 77 | 72.3% | 15.6% | 78 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA688
39% late · 362 flights
-
UA641
8% late · 344 flights
-
UA755
21% late · 323 flights
-
UA1392
20% late · 180 flights
-
UA1709
27% late · 96 flights
-
UA673
9% late · 37 flights
-
YX3552
22% late · 37 flights
-
UA2321
16% late · 31 flights
-
UA2323
19% late · 31 flights
-
YX3615
35% late · 27 flights
-
UA1047
95% late · 21 flights
-
UA1183
15% late · 21 flights
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