Best Time to Fly DEN to BOS: On-Time Stats by Hour & Airline
Denver International → Logan International
Data through July 2026 · Last updated October 18, 2026
3,872 flights were scheduled from Denver (DEN) to Boston (BOS) in the last 12 months, and 70.9% of those that flew arrived on time, 6.8 points below the US average of 77.6%.
Among 4 airlines, United Airlines led with 77.3% on time and Southwest Airlines was last with 58.4%.
Over 24 months, Saturday was the most reliable day (79% on time) and September the worst month (63%).
The cancellation rate was 1.4% (US average 1.8%).
DEN to BOS 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 |
|---|---|---|---|---|
| United Airlines | 77.3% | 69 min | 0.9% | 1,900 |
| Delta Air Lines | 74.0% | 56 min | 1.3% | 372 |
| JetBlue | 67.9% | 85 min | 3.1% | 686 |
| Southwest Airlines | 58.4% | 64 min | 1.1% | 914 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to BOS
On-time arrival % by scheduled departure hour (local time), 7,872 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 4 | |
| 6am–7am | 91.1% | 0.0% | 79 |
| 7am–8am | 91.1% | 0.0% | 305 |
| 8am–9am | 85.8% | 0.7% | 547 |
| 9am–10am | 75.4% | 0.9% | 979 |
| 10am–11am | 72.3% | 0.6% | 320 |
| 11am–12pm | 74.8% | 0.8% | 920 |
| 12pm–1pm | 67.2% | 1.5% | 65 |
| 1pm–2pm | 67.3% | 1.4% | 814 |
| 2pm–3pm | 62.0% | 0.9% | 556 |
| 3pm–4pm | 57.9% | 2.0% | 303 |
| 4pm–5pm | 66.1% | 0.6% | 317 |
| 5pm–6pm | 67.7% | 0.6% | 995 |
| 6pm–7pm | 49.8% | 0.5% | 200 |
| 7pm–8pm | 56.0% | 0.4% | 226 |
| 8pm–9pm | Limited data | 1 | |
| 10pm–11pm | 69.3% | 0.9% | 217 |
| 11pm–12am | 82.1% | 0.9% | 1,024 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN to BOS
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) | 89.1% | +15.3 pts | 0.0% | 147 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.4% | +5.7 pts | 0.9% | 319 |
| Summer peak (Jun 15 - Aug 15) | 64.5% | -9.3 pts | 1.3% | 1,657 |
| All other days | 73.8% | — | 0.7% | 5,749 |
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).