Best Time to Fly BOS to DEN: On-Time Stats by Hour & Airline
Logan International → Denver International
Data through July 2026 · Last updated October 18, 2026
3,868 flights were scheduled from Boston (BOS) to Denver (DEN) in the last 12 months, and 77.0% of those that flew arrived on time, 0.6 points below the US average of 77.6%.
Among 4 airlines, Delta Air Lines led with 84.4% on time and Southwest Airlines was last with 65.8%.
Over 24 months, Wednesday was the most reliable day (81% on time) and June the worst month (71%).
The cancellation rate was 1.3% (US average 1.8%).
BOS to DEN on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 84.4% | 47 min | 1.6% | 372 |
| United Airlines | 83.1% | 66 min | 1.1% | 1,897 |
| JetBlue | 70.9% | 62 min | 2.5% | 685 |
| Southwest Airlines | 65.8% | 54 min | 1.0% | 914 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOS to DEN
On-time arrival % by scheduled departure hour (local time), 7,920 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 88.5% | 0.0% | 313 |
| 6am–7am | 90.4% | 2.0% | 404 |
| 7am–8am | 85.8% | 1.1% | 1,624 |
| 8am–9am | 82.3% | 0.0% | 34 |
| 9am–10am | 88.8% | 0.6% | 791 |
| 10am–11am | 82.3% | 0.7% | 284 |
| 11am–12pm | 85.1% | 0.9% | 782 |
| 12pm–1pm | 79.0% | 0.4% | 233 |
| 1pm–2pm | 79.9% | 0.5% | 204 |
| 2pm–3pm | 73.5% | 0.8% | 122 |
| 3pm–4pm | 78.8% | 0.5% | 787 |
| 4pm–5pm | 67.5% | 0.7% | 845 |
| 5pm–6pm | 40.7% | 0.4% | 245 |
| 6pm–7pm | 54.6% | 0.8% | 362 |
| 7pm–8pm | 55.6% | 2.3% | 304 |
| 8pm–9pm | 64.6% | 0.4% | 539 |
| 9pm–10pm | 72.7% | 2.2% | 45 |
| 10pm–11pm | Limited data | 2 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BOS to DEN
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 85.0% | +5.8 pts | 0.0% | 147 |
| Christmas & New Year (Dec 20 - Jan 3) | 77.9% | -1.3 pts | 0.6% | 319 |
| Summer peak (Jun 15 - Aug 15) | 70.8% | -8.4 pts | 1.3% | 1,657 |
| All other days | 79.2% | — | 0.7% | 5,797 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).