United Airlines BOS to ORD on-time performance
United Airlines nonstop flights from Boston to Chicago · Aug 2025 – Jul 2026
On-time arrivals
76%
arrived < 15 min late
Cancelled
2.0%
54 flights
Avg arrival delay
22 min
85 min when late
Rank on route
#2 of 6
route average 73% on time
Key facts
- United Airlines flights on BOS to ORD arrived on time 76% of the time in Aug 2025 – Jul 2026.
- 2% were cancelled, and 9% arrived an hour or more late.
- That ranks #2 of 6 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (46%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion46%
- Late-arriving aircraft32%
- Airline (crew, maintenance, cleaning, fueling)20%
- Extreme weather2%
- Security0%
Other airlines on BOS to ORD
- American Airlines73% on time · 26 min avg delay
- Delta Air Lines66% on time · 26 min avg delay
- Republic Airways71% on time · 24 min avg delay
- JetBlue70% on time · 23 min avg delay
- Envoy Air77% on time · 24 min avg delay
Full BOS to ORD comparison →
United Airlines on-time record across all routes →
2,733 United Airlines flights tracked on this route; 54 cancelled, 10 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.