Best Time to Fly BWI to DEN: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Denver International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 77.1% of Baltimore (BWI) to Denver (DEN) flights arrived on time (2,814 scheduled flights). That is 0.5 points below the national average of 77.6%.
Among 3 airlines, United Airlines led with 85.5% on time and Frontier Airlines was last with 60.5%.
Over 24 months, Tuesday was the most reliable day (82% on time) and June the worst month (65%).
The cancellation rate was 1.2% (US average 1.8%).
BWI 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 |
|---|---|---|---|---|
| United Airlines | 85.5% | 66 min | 0.5% | 871 |
| Southwest Airlines | 73.6% | 50 min | 1.5% | 1,900 |
| Frontier Airlines | 60.5% | 63 min | 0.0% | 43 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to DEN
On-time arrival % by scheduled departure hour (local time), 5,864 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 90.2% | 0.9% | 455 |
| 7am–8am | 90.2% | 0.8% | 402 |
| 8am–9am | 87.3% | 0.6% | 900 |
| 9am–10am | 85.5% | 2.0% | 295 |
| 10am–11am | 85.1% | 0.6% | 540 |
| 11am–12pm | 90.6% | 0.8% | 118 |
| 12pm–1pm | 80.7% | 1.2% | 241 |
| 1pm–2pm | 74.6% | 2.5% | 199 |
| 2pm–3pm | 74.5% | 0.9% | 231 |
| 3pm–4pm | 63.6% | 1.4% | 285 |
| 4pm–5pm | 72.9% | 0.9% | 973 |
| 5pm–6pm | 54.1% | 0.8% | 352 |
| 6pm–7pm | 63.0% | 1.8% | 328 |
| 7pm–8pm | 76.0% | 1.3% | 156 |
| 8pm–9pm | 61.7% | 2.4% | 254 |
| 9pm–10pm | 58.2% | 0.0% | 110 |
| 10pm–11pm | Limited data | 25 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BWI 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) | 79.3% | -1.0 pts | 0.0% | 116 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.7% | -6.6 pts | 0.4% | 271 |
| Summer peak (Jun 15 - Aug 15) | 66.8% | -13.5 pts | 2.1% | 1,164 |
| All other days | 80.3% | — | 0.9% | 4,313 |
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).