Route
BOS → DEN
Boston Logan International Airport Denver International Airport
How punctual is this route?
- On-time arrivals
- 75.7%
- Less than 15 minutes late
- Cancelled
- 1.4%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,847
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Airline (crew, maintenance, cleaning) 27%
- Air traffic control & airport 27%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 72.5% | 333 |
| October 2025 | 77.1% | 342 |
| November 2025 | 87.7% | 293 |
| December 2025 | 73.5% | 301 |
| January 2026 | 72.7% | 259 |
| February 2026 | 79.3% | 266 |
| March 2026 | 75.8% | 300 |
| April 2026 | 84.5% | 284 |
| May 2026 | 80.7% | 323 |
| June 2026 | 71.0% | 374 |
| July 2026 | 73.0% | 396 |
| August 2026 | 65.1% | 376 |
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 | 1,884 | 82.5% | 1.1% | 75 min |
| Southwest Airlines | 908 | 63.9% | 1.0% | 59 min |
| JetBlue Airways | 690 | 68.4% | 2.6% | 66 min |
| Delta Air Lines | 365 | 83.6% | 1.4% | 62 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL499
16% late · 365 flights
-
UA414
11% late · 364 flights
-
UA647
10% late · 364 flights
-
UA2297
15% late · 363 flights
-
UA800
27% late · 284 flights
-
B6993
43% late · 276 flights
-
UA662
11% late · 275 flights
-
B6393
24% late · 227 flights
-
B6493
13% late · 105 flights
-
B6793
39% late · 82 flights
-
UA2433
46% late · 79 flights
-
WN1427
19% late · 64 flights
-
WN4156
11% late · 61 flights
-
WN3705
10% late · 58 flights
-
UA2413
44% late · 51 flights
-
WN742
76% late · 49 flights
-
WN1363
16% late · 47 flights
-
WN3182
40% late · 42 flights
-
WN2508
24% late · 41 flights
-
WN4208
37% late · 35 flights
-
WN1257
12% late · 33 flights
-
WN892
56% late · 32 flights
-
WN3908
53% late · 31 flights
-
WN3279
17% late · 30 flights
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