Route
ORD → BOS
Chicago O'Hare International Airport Boston Logan International Airport
How punctual is this route?
- On-time arrivals
- 66.6%
- Less than 15 minutes late
- Cancelled
- 3.0%
- Of scheduled flights
- Average delay when late
- 84 min
- Flights arriving 15+ minutes late
- Flights tracked
- 7,864
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Air traffic control & airport 33%
- Airline (crew, maintenance, cleaning) 18%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 56.2% | 660 |
| October 2025 | 57.6% | 695 |
| November 2025 | 73.1% | 639 |
| December 2025 | 66.2% | 557 |
| January 2026 | 69.0% | 500 |
| February 2026 | 71.2% | 503 |
| March 2026 | 66.3% | 598 |
| April 2026 | 69.9% | 641 |
| May 2026 | 76.6% | 740 |
| June 2026 | 68.3% | 751 |
| July 2026 | 66.6% | 786 |
| August 2026 | 61.1% | 794 |
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 | 2,794 | 68.0% | 1.8% | 83 min |
| American Airlines | 2,164 | 59.5% | 2.9% | 81 min |
| Delta Air Lines | 981 | 67.4% | 3.5% | 92 min |
| Republic Airways | 932 | 69.7% | 5.9% | 82 min |
| JetBlue Airways | 553 | 68.1% | 4.0% | 100 min |
| Envoy Air | 440 | 82.7% | 2.5% | 73 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
B6312
30% late · 335 flights
-
UA1693
38% late · 319 flights
-
DL2570
27% late · 242 flights
-
B61012
34% late · 215 flights
-
AA3107
46% late · 209 flights
-
UA1779
34% late · 202 flights
-
UA2067
10% late · 191 flights
-
UA1989
42% late · 184 flights
-
MQ3710
17% late · 180 flights
-
DL2646
41% late · 170 flights
-
AA2682
45% late · 164 flights
-
UA399
42% late · 162 flights
-
AA1457
35% late · 159 flights
-
UA1606
22% late · 148 flights
-
UA1117
14% late · 146 flights
-
DL2828
13% late · 141 flights
-
UA2466
54% late · 132 flights
-
UA2331
47% late · 123 flights
-
DL2816
42% late · 117 flights
-
DL1602
22% late · 109 flights
-
AA1033
48% late · 108 flights
-
YX4384
38% late · 107 flights
-
AA1461
59% late · 105 flights
-
AA2303
52% late · 102 flights
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