Route Reliability
Denver → Washington
DEN–IAD · 1,452 miles · Denver International Airport to Washington Dulles International Airport
- 80%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 0.7%
- Cancelled
- 3,622
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines84%2,785 flights
- 2.Southwest Airlines66%837 flights
What the data says
The late departure is the smart one here.
DEN–IAD flights departing between 9 PM–12 AM arrived on time 93% of the time, versus 51% between 6–9 PM.
Thursday is the weak spot.
DEN–IAD flights arrived on time 84% of the time on Tuesdays. On Thursdays: 77%.
United Airlines has a clear lead on this route.
United Airlines arrived on time 84% of the time on this route; Southwest Airlines managed 66%.
Slipping a little lately.
DEN–IAD flights arrived on time 82% of the time over the last three months in the data, compared with 87% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon78%(535 flights)
- Tue84%(499 flights)
- Wed81%(509 flights)
- Thu77%(528 flights)
- Fri81%(525 flights)
- Sat81%(479 flights)
- Sun79%(511 flights)
- 12–3 AM—(2 flights)
- 6–9 AM93%(701 flights)
- 9 AM–12 PM79%(884 flights)
- 12–3 PM84%(499 flights)
- 3–6 PM73%(868 flights)
- 6–9 PM51%(296 flights)
- 9 PM–12 AM93%(336 flights)
Jun 69% → May 81% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 69% | 317 |
| July 2025 | 65% | 350 |
| August 2025 | 73% | 335 |
| September 2025 | 81% | 292 |
| October 2025 | 86% | 283 |
| November 2025 | 88% | 274 |
| December 2025 | 86% | 305 |
| January 2026 | 90% | 268 |
| February 2026 | 85% | 257 |
| March 2026 | 77% | 298 |
| April 2026 | 89% | 291 |
| May 2026 | 81% | 316 |
Same trip, other airports
Keep nerding
Based on 3,622 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.