Route reliability
Chicago (ORD) to Boston (BOS): which airline is most on time?
On-time arrivals, cancellations and long delays for every airline that reported nonstop flights from Chicago, IL (ORD) to Boston, MA (BOS), September 2025 to August 2026.
Chicago, ILBoston, MA
Route at a glance · September 2025 to August 2026
ORD to BOS
Chicago, IL to Boston, MA
- On time
- 64.5%vs 75.6% U.S. average Worse than average
- Cancelled
- 3.0%vs 1.9% U.S. average Worse than average
- 60+ min late
- 15.1%vs 8.1% U.S. average Worse than average
- Scheduled flights
- 7,864in 12 months6 airlines
- Most reliable airline
- Envoy Air80.2% on time · 440 flights
On time less often than the U.S. average, with more cancellations.
Airlines on this route
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Diverted | Flights |
|---|---|---|---|---|---|---|
| 1. Envoy Air Operating carrier; sold as American Eagle Most reliable | 80.2% | 2.5% | 6.1% | 67 min | 0.5% | 440 |
| 2. United Airlines | 66.7% | 1.8% | 14.7% | 80 min | 0.2% | 2,794 |
| 3. Republic Airways Operating carrier; sold as American Eagle, Delta Connection, United Express | 65.6% | 5.9% | 11.9% | 79 min | 0.1% | 932 |
| 4. JetBlue Airways | 65.1% | 4.0% | 14.6% | 98 min | 0.4% | 553 |
| 5. Delta Air Lines | 65.0% | 3.5% | 16.0% | 90 min | 0.1% | 981 |
| 6. American Airlines | 57.6% | 2.9% | 18.4% | 78 min | 0.2% | 2,164 |
On time = arrived within 15 minutes of schedule. Avg delay when late = average arrival delay of flights 15+ minutes late. "Most reliable" needs at least 300 flights in 12 months. Tap a heading to sort.
What this means
Envoy Air has the strongest record on this route.
- Envoy Air had the best on-time record from Chicago (ORD) to Boston (BOS): 80.2% of its 440 scheduled flights arrived within 15 minutes of schedule, compared with 57.6% for American Airlines.
- 3.0% of flights on this route were cancelled (about 1 in 33), 1.1 points higher than the U.S. average of 1.9%.
- 15.1% of flights, about 1 in 7, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 81 min.
- Overall, 64.5% of flights on this route arrived on time, 11.1 points lower than the U.S. average of 75.6%.
- Over the last 3 years, November was the most reliable month on this route (78.6% on time) and July the least reliable (63.6%).
- Cancellations peaked in January, when 5.0% of flights were cancelled.
- Flights scheduled to depart 6 am to 7 am were the most punctual (88.4% on time); flights scheduled to depart 3 pm to 4 pm were the least (45.9%).
- In the other direction, Boston (BOS) to Chicago (ORD), 69.4% of flights were on time and 3.0% were cancelled. Compare airlines BOS to ORD.
Best and worst months to fly ORD to BOS
Share of scheduled flights on time 12-month average 64.5%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 70.6% | 1,452 |
| February | 76.2% | 1,408 |
| March | 73.5% | 1,677 |
| April | 75.6% | 1,720 |
| May | 69.9% | 2,008 |
| June | 68.0% | 2,075 |
| July | 63.6% | 2,129 |
| August | 65.5% | 2,182 |
| September | 66.4% | 1,836 |
| October | 72.8% | 1,852 |
| November | 78.6% | 1,689 |
| December | 74.0% | 1,522 |
| Airline | Best month | Worst month |
|---|---|---|
| Envoy Air | June (92.0%) | January (77.1%) |
| United Airlines | February (80.2%) | September (64.4%) |
| Republic Airways | April (81.0%) | June (62.2%) |
| JetBlue Airways | April (86.3%) | July (57.0%) |
| Delta Air Lines | November (77.6%) | July (65.8%) |
| American Airlines | November (79.8%) | July (56.8%) |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 55.6% | 660 |
| Oct 2025 | 57.0% | 695 |
| Nov 2025 | 69.3% | 639 |
| Dec 2025 | 65.2% | 557 |
| Jan 2026 | 64.6% | 500 |
| Feb 2026 | 66.4% | 503 |
| Mar 2026 | 62.9% | 598 |
| Apr 2026 | 68.3% | 641 |
| May 2026 | 75.8% | 740 |
| Jun 2026 | 66.4% | 751 |
| Jul 2026 | 63.2% | 786 |
| Aug 2026 | 59.8% | 794 |
Best and worst departure times
Share of scheduled flights on time
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing before 6 am | Insufficient sample | 3 |
| Departing 6 am to 7 am | 88.4% | 586 |
| Departing 7 am to 8 am | 82.5% | 976 |
| Departing 8 am to 9 am | 79.2% | 389 |
| Departing 9 am to 10 am | 82.1% | 468 |
| Departing 10 am to 11 am | 69.9% | 662 |
| Departing 11 am to noon | 61.3% | 563 |
| Departing noon to 1 pm | 60.4% | 187 |
| Departing 1 pm to 2 pm | 55.6% | 637 |
| Departing 2 pm to 3 pm | 57.1% | 294 |
| Departing 3 pm to 4 pm | 45.9% | 553 |
| Departing 4 pm to 5 pm | 50.6% | 344 |
| Departing 5 pm to 6 pm | 49.6% | 337 |
| Departing 6 pm to 7 pm | 55.9% | 456 |
| Departing 7 pm to 8 pm | 53.7% | 682 |
| Departing 8 pm to 9 pm | 49.6% | 490 |
| Departing 9 pm to 10 pm | 65.0% | 237 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Nonstop scheduled flights from Chicago, IL (ORD) to Boston, MA (BOS), one direction. Airlines that report to the DOT only.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.