United Airlines BOS to IAD on-time performance
United Airlines nonstop flights from Boston to Washington · Aug 2025 – Jul 2026
On-time arrivals
84%
arrived < 15 min late
Cancelled
2.3%
33 flights
Avg arrival delay
13 min
76 min when late
Rank on route
#1 of 2
route average 84% on time
Key facts
- United Airlines flights on BOS to IAD arrived on time 84% of the time in Aug 2025 – Jul 2026.
- 2.3% were cancelled, and 6% arrived an hour or more late.
- That ranks #1 of 2 airlines on this route, which averaged 84% on time overall.
- The largest source of delay minutes was late-arriving aircraft (47%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft47%
- Air traffic control & airport congestion34%
- Airline (crew, maintenance, cleaning, fueling)18%
- Extreme weather1%
- Security0%
Other airlines on BOS to IAD
- Republic Airways78% on time · 38 min avg delay
Full BOS to IAD comparison →
United Airlines on-time record across all routes →
1,459 United Airlines flights tracked on this route; 33 cancelled, 1 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.