United Airlines BOS to DEN on-time performance
United Airlines nonstop flights from Boston to Denver · Aug 2025 – Jul 2026
On-time arrivals
83%
arrived < 15 min late
Cancelled
1.1%
20 flights
Avg arrival delay
12 min
66 min when late
Rank on route
#2 of 4
route average 77% on time
Key facts
- United Airlines flights on BOS to DEN arrived on time 83% of the time in Aug 2025 – Jul 2026.
- 1.1% were cancelled, and 6% arrived an hour or more late.
- That ranks #2 of 4 airlines on this route, which averaged 77% on time overall.
- The largest source of delay minutes was late-arriving aircraft (50%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft50%
- Air traffic control & airport congestion28%
- Airline (crew, maintenance, cleaning, fueling)21%
- Extreme weather1%
- Security0%
Other airlines on BOS to DEN
- Southwest Airlines66% on time · 20 min avg delay
- JetBlue71% on time · 19 min avg delay
- Delta Air Lines84% on time · 9 min avg delay
Full BOS to DEN comparison →
United Airlines on-time record across all routes →
1,897 United Airlines flights tracked on this route; 20 cancelled, 6 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.