United Airlines DEN to BOS on-time performance
United Airlines nonstop flights from Denver to Boston · Aug 2025 – Jul 2026
On-time arrivals
77%
arrived < 15 min late
Cancelled
0.9%
17 flights
Avg arrival delay
17 min
69 min when late
Rank on route
#1 of 4
route average 71% on time
Key facts
- United Airlines flights on DEN to BOS arrived on time 77% of the time in Aug 2025 – Jul 2026.
- 0.9% were cancelled, and 9% arrived an hour or more late.
- That ranks #1 of 4 airlines on this route, which averaged 71% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (54%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion54%
- Late-arriving aircraft32%
- Airline (crew, maintenance, cleaning, fueling)13%
- Extreme weather1%
- Security0%
Other airlines on DEN to BOS
- Southwest Airlines58% on time · 28 min avg delay
- JetBlue68% on time · 28 min avg delay
- Delta Air Lines74% on time · 16 min avg delay
Full DEN to BOS comparison →
United Airlines on-time record across all routes →
1,900 United Airlines flights tracked on this route; 17 cancelled, 4 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.