Route
BOS → ORD
Boston Logan International Airport Chicago O'Hare International Airport
How punctual is this route?
- On-time arrivals
- 71.9%
- Less than 15 minutes late
- Cancelled
- 3.0%
- Of scheduled flights
- Average delay when late
- 91 min
- Flights arriving 15+ minutes late
- Flights tracked
- 7,860
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 38%
- Air traffic control & airport 38%
- Airline (crew, maintenance, cleaning) 20%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 67.9% | 660 |
| October 2025 | 64.0% | 695 |
| November 2025 | 71.8% | 642 |
| December 2025 | 69.7% | 556 |
| January 2026 | 70.2% | 500 |
| February 2026 | 83.4% | 502 |
| March 2026 | 70.9% | 597 |
| April 2026 | 77.1% | 641 |
| May 2026 | 78.7% | 738 |
| June 2026 | 76.8% | 750 |
| July 2026 | 72.8% | 786 |
| August 2026 | 63.1% | 793 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 2,791 | 74.5% | 1.8% | 90 min |
| American Airlines | 2,165 | 73.3% | 2.9% | 100 min |
| Delta Air Lines | 981 | 63.7% | 3.5% | 78 min |
| Republic Airways | 930 | 71.2% | 5.9% | 85 min |
| JetBlue Airways | 552 | 66.6% | 3.3% | 82 min |
| Envoy Air | 441 | 75.7% | 3.4% | 115 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA2040
47% late · 360 flights
-
UA1414
6% late · 337 flights
-
UA1732
16% late · 332 flights
-
UA1349
14% late · 308 flights
-
UA1015
50% late · 305 flights
-
B6311
21% late · 285 flights
-
DL2570
19% late · 266 flights
-
B6811
47% late · 264 flights
-
DL2646
41% late · 259 flights
-
MQ3711
22% late · 216 flights
-
AA1509
11% late · 206 flights
-
AA1239
9% late · 165 flights
-
UA503
18% late · 164 flights
-
UA2229
48% late · 150 flights
-
DL2804
56% late · 140 flights
-
AA3324
6% late · 138 flights
-
AA1328
10% late · 125 flights
-
DL2816
23% late · 117 flights
-
DL2679
31% late · 101 flights
-
DL2676
65% late · 91 flights
-
YX4413
33% late · 87 flights
-
YX5858
36% late · 85 flights
-
AA1554
39% late · 76 flights
-
AA1592
61% late · 76 flights
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