Route
DEN → BOS
Denver International Airport Boston Logan International Airport
How punctual is this route?
- On-time arrivals
- 69.6%
- Less than 15 minutes late
- Cancelled
- 1.5%
- Of scheduled flights
- Average delay when late
- 76 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,851
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 42%
- Late-arriving aircraft 37%
- Airline (crew, maintenance, cleaning) 20%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 51.4% | 333 |
| October 2025 | 59.6% | 343 |
| November 2025 | 80.1% | 292 |
| December 2025 | 85.7% | 303 |
| January 2026 | 85.4% | 260 |
| February 2026 | 76.1% | 267 |
| March 2026 | 74.2% | 300 |
| April 2026 | 73.2% | 284 |
| May 2026 | 75.8% | 323 |
| June 2026 | 66.4% | 374 |
| July 2026 | 60.2% | 396 |
| August 2026 | 59.5% | 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 | 1,887 | 76.8% | 1.0% | 78 min |
| Southwest Airlines | 908 | 57.4% | 1.1% | 69 min |
| JetBlue Airways | 691 | 64.6% | 3.5% | 87 min |
| Delta Air Lines | 365 | 71.7% | 1.1% | 66 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL499
28% late · 349 flights
-
UA597
32% late · 339 flights
-
UA558
8% late · 337 flights
-
B6394
38% late · 309 flights
-
B6994
33% late · 276 flights
-
UA1232
15% late · 236 flights
-
UA1356
30% late · 195 flights
-
UA2656
9% late · 181 flights
-
B6494
34% late · 105 flights
-
UA716
28% late · 89 flights
-
UA779
30% late · 82 flights
-
WN323
13% late · 64 flights
-
UA2461
42% late · 59 flights
-
WN378
70% late · 57 flights
-
UA1587
25% late · 52 flights
-
WN1494
85% late · 52 flights
-
WN735
63% late · 52 flights
-
WN1797
32% late · 50 flights
-
WN2121
31% late · 47 flights
-
UA2798
56% late · 44 flights
-
WN3690
20% late · 44 flights
-
WN1365
19% late · 42 flights
-
WN737
8% late · 42 flights
-
WN2462
42% late · 33 flights
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