Delta Air Lines ORD to BOS on-time performance
Delta Air Lines nonstop flights from Chicago to Boston · Aug 2025 – Jul 2026
On-time arrivals
69%
arrived < 15 min late
Cancelled
3.4%
33 flights
Avg arrival delay
28 min
90 min when late
Rank on route
#4 of 6
route average 68% on time
Key facts
- Delta Air Lines flights on ORD to BOS arrived on time 69% of the time in Aug 2025 – Jul 2026.
- 3.4% were cancelled, and 15% arrived an hour or more late.
- That ranks #4 of 6 airlines on this route, which averaged 68% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (37%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion37%
- Late-arriving aircraft34%
- Airline (crew, maintenance, cleaning, fueling)27%
- Extreme weather1%
- Security0%
Other airlines on ORD to BOS
- United Airlines69% on time · 25 min avg delay
- American Airlines60% on time · 31 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 →
Delta Air Lines on-time record across all routes →
970 Delta Air Lines flights tracked on this route; 33 cancelled, 1 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.