United Airlines ORD to BOS on-time performance
United Airlines nonstop flights from Chicago to Boston · Aug 2025 – Jul 2026
On-time arrivals
69%
arrived < 15 min late
Cancelled
2.0%
55 flights
Avg arrival delay
25 min
78 min when late
Rank on route
#5 of 6
route average 68% on time
Key facts
- United Airlines flights on ORD to BOS arrived on time 69% of the time in Aug 2025 – Jul 2026.
- 2% were cancelled, and 14% arrived an hour or more late.
- That ranks #5 of 6 airlines on this route, which averaged 68% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (44%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion44%
- Late-arriving aircraft39%
- Airline (crew, maintenance, cleaning, fueling)12%
- Extreme weather4%
- Security0%
Other airlines on ORD to BOS
- American Airlines60% on time · 31 min avg delay
- Delta Air Lines69% on time · 28 min avg delay
- Republic Airways70% on time · 24 min avg delay
- JetBlue72% on time · 28 min avg delay
- Envoy Air83% on time · 13 min avg delay
Full ORD to BOS comparison →
United Airlines on-time record across all routes →
2,735 United Airlines flights tracked on this route; 55 cancelled, 5 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.