Best Time to Fly ORD to BOS: On-Time Stats by Hour & Airline
Chicago O'Hare International → Logan International
Data through July 2026 · Last updated October 18, 2026
7,755 flights were scheduled from Chicago (ORD) to Boston (BOS) in the last 12 months, and 67.8% of those that flew arrived on time, 9.8 points below the US average of 77.6%.
Among 6 airlines, Envoy Air led with 82.7% on time and American Airlines was last with 60.2%.
Over 24 months, Saturday was the most reliable day (78% on time) and July the worst month (65%).
The cancellation rate was 3.0% (US average 1.8%).
ORD to BOS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Air | 82.7% | 68 min | 2.5% | 441 |
| JetBlue | 72.1% | 98 min | 3.3% | 545 |
| Republic Airways | 70.4% | 77 min | 5.7% | 908 |
| Delta Air Lines | 69.3% | 90 min | 3.4% | 970 |
| United Airlines | 69.3% | 78 min | 2.0% | 2,735 |
| American Airlines | 60.2% | 76 min | 3.0% | 2,156 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to BOS
On-time arrival % by scheduled departure hour (local time), 14,850 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 3 | |
| 6am–7am | 90.0% | 1.3% | 976 |
| 7am–8am | 87.0% | 1.5% | 1,874 |
| 8am–9am | 82.8% | 0.9% | 895 |
| 9am–10am | 84.6% | 0.6% | 1,025 |
| 10am–11am | 77.5% | 1.6% | 1,132 |
| 11am–12pm | 68.3% | 1.2% | 882 |
| 12pm–1pm | 72.9% | 0.8% | 474 |
| 1pm–2pm | 63.6% | 1.9% | 1,244 |
| 2pm–3pm | 64.8% | 1.7% | 757 |
| 3pm–4pm | 50.6% | 2.3% | 832 |
| 4pm–5pm | 61.5% | 2.9% | 653 |
| 5pm–6pm | 57.7% | 3.0% | 534 |
| 6pm–7pm | 67.8% | 2.1% | 1,253 |
| 7pm–8pm | 58.2% | 4.2% | 933 |
| 8pm–9pm | 61.1% | 4.5% | 946 |
| 9pm–10pm | 69.7% | 2.8% | 434 |
| 10pm–11pm | Limited data | 1 | |
| 11pm–12am | Limited data | 2 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD to BOS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 66.4% | -6.8 pts | 3.5% | 288 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.9% | -2.3 pts | 0.4% | 452 |
| Summer peak (Jun 15 - Aug 15) | 66.3% | -6.9 pts | 2.7% | 2,901 |
| All other days | 73.2% | — | 1.9% | 11,209 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).