Delta Air Lines BOS to ORD on-time performance
Delta Air Lines nonstop flights from Boston to Chicago · Aug 2025 – Jul 2026
On-time arrivals
66%
arrived < 15 min late
Cancelled
3.4%
33 flights
Avg arrival delay
26 min
75 min when late
Rank on route
#6 of 6
route average 73% on time
Key facts
- Delta Air Lines flights on BOS to ORD arrived on time 66% of the time in Aug 2025 – Jul 2026.
- 3.4% were cancelled, and 15% arrived an hour or more late.
- That ranks #6 of 6 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was late-arriving aircraft (40%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft40%
- Air traffic control & airport congestion31%
- Airline (crew, maintenance, cleaning, fueling)28%
- Extreme weather0%
- Security0%
Other airlines on BOS to ORD
- United Airlines76% on time · 22 min avg delay
- American Airlines73% 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 →
Delta Air Lines on-time record across all routes →
970 Delta Air Lines flights tracked on this route; 33 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.