Baltimore (BWI) to Denver (DEN): On-Time Performance
Data through July 2026
The calendar drives reliability on BWI–DEN. October 2024 flights landed on schedule 90% of the time, but December 2025 dropped to 61% — a gap of 29 points. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 59%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 7.7
- last 12 months
- Duration
- 4h 2m
- scheduled
- Distance
- 1,491 mi
Best airline from BWI to DEN
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 85% | 12 min | 0.7% | 1,926 |
| Southwest Airlines | 74% | 16 min | 1.3% | 4,082 |
| Frontier Airlines | 60% | 41 min | 1.7% | 177 |
Monthly on-time trend
Best time to fly from BWI to DEN
Aim for departures around 6 a.m. (90% on-time); avoid 10 p.m. departures (41%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 15 min |
| Tuesdaybest | 81% | 12 min |
| Wednesday | 75% | 15 min |
| Thursday | 76% | 14 min |
| Friday | 75% | 18 min |
| Saturday | 75% | 17 min |
| Sunday | 77% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft30%
- Airline operations32%
- National airspace system30%
- Weather7%
- Security1%
Frequently asked questions
- How often are flights from BWI to DEN delayed?
- 23% of BWI–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from BWI to DEN?
- United Airlines has the best on-time record on this route at 85%, based on 1,926 flights. 3 airlines flew BWI–DEN frequently enough to compare in this period.
- What is the best time of day to fly from BWI to DEN?
- Departures around 6 a.m. have the best record (90% on-time), while departures around 10 p.m. have the worst (41%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BWI to DEN?
- The scheduled BWI–DEN flight time averages 4h 2m over 1,491 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are BWI to DEN flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from BWI to DEN?
- December 2025 was the roughest month in this dataset, with only 61% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 29-point gap is worth planning around.
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Based on 6,185 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.