Boston (BOS) to Denver (DEN): On-Time Performance
Data through May 2026
Boston (BOS) to Denver (DEN) effectively runs on two schedules. In March 2025, 89% of arrivals were on time; in February 2025 that fell to 62% — a 27-point seasonal swing. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 57%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 11
- last 12 months
- Duration
- 4h 43m
- scheduled
- Distance
- 1,754 mi
Best airline from BOS to DEN
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 83% | 11 min | 0.8% | 3,939 |
| Delta Air Lines | 76% | 13 min | 1.7% | 832 |
| JetBlue Airways | 73% | 19 min | 1.0% | 1,302 |
| Southwest Airlines | 72% | 17 min | 0.5% | 1,832 |
Monthly on-time trend
Best time to fly from BOS to DEN
Aim for departures around 6 a.m. (91% on-time); avoid 5 p.m. departures (47%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 14 min |
| Tuesdaybest | 81% | 12 min |
| Wednesday | 80% | 11 min |
| Thursday | 76% | 16 min |
| Friday | 74% | 19 min |
| Saturday | 78% | 12 min |
| Sunday | 77% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft42%
- Airline operations27%
- National airspace system28%
- Weather3%
Frequently asked questions
- How often are flights from BOS to DEN delayed?
- 22% of BOS–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from BOS to DEN?
- United Airlines has the best on-time record on this route at 83%, based on 3,939 flights. 4 airlines flew BOS–DEN frequently enough to compare in this period.
- What is the best time of day to fly from BOS to DEN?
- Departures around 6 a.m. have the best record (91% on-time), while departures around 5 p.m. have the worst (47%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOS to DEN?
- The scheduled BOS–DEN flight time averages 4h 43m over 1,754 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are BOS to DEN flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from BOS to DEN?
- February 2025 was the roughest month in this dataset, with only 62% of arrivals on time. The best was March 2025 at 89%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 7,905 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.