Best Time to Fly DEN to BWI: On-Time Stats by Hour & Airline
Denver International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 77.5% of Denver (DEN) to Baltimore (BWI) flights arrived on time (2,815 scheduled flights). That is in line with the national average of 77.6%.
United Airlines was the most punctual of the 3 airlines on the route at 81.5%, while Southwest Airlines trailed at 75.6%.
October has been the best month (86% on time) and Sunday the weakest day of the week (74%).
1.0% of flights were cancelled, versus 1.8% nationally.
DEN to BWI 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 | 81.5% | 52 min | 0.7% | 870 |
| Frontier Airlines | 79.1% | 67 min | 0.0% | 43 |
| Southwest Airlines | 75.6% | 51 min | 1.2% | 1,902 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to BWI
On-time arrival % by scheduled departure hour (local time), 5,898 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 7 | |
| 5am–6am | 95.4% | 0.6% | 484 |
| 6am–7am | 95.9% | 0.6% | 171 |
| 7am–8am | 87.1% | 0.5% | 384 |
| 8am–9am | 84.4% | 0.0% | 238 |
| 9am–10am | 87.6% | 0.3% | 783 |
| 10am–11am | 77.8% | 0.9% | 349 |
| 11am–12pm | 83.5% | 0.0% | 171 |
| 12pm–1pm | 74.2% | 2.6% | 152 |
| 1pm–2pm | 68.0% | 1.1% | 177 |
| 2pm–3pm | 74.4% | 1.2% | 414 |
| 3pm–4pm | 66.3% | 3.0% | 198 |
| 4pm–5pm | 65.8% | 3.3% | 214 |
| 5pm–6pm | 62.3% | 0.9% | 841 |
| 6pm–7pm | 67.8% | 1.9% | 320 |
| 7pm–8pm | 45.1% | 0.4% | 259 |
| 8pm–9pm | Limited data | 31 | |
| 11pm–12am | 83.0% | 0.4% | 705 |
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 BWI
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) | 84.0% | +4.6 pts | 0.0% | 119 |
| Christmas & New Year (Dec 20 - Jan 3) | 83.4% | +4.0 pts | 0.8% | 267 |
| Summer peak (Jun 15 - Aug 15) | 65.8% | -13.6 pts | 1.6% | 1,164 |
| All other days | 79.4% | — | 0.8% | 4,348 |
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).