Route Reliability
Portland → Denver
PDX–DEN · 991 miles · Portland International Airport to Denver International Airport
- 81%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 0.5%
- Cancelled
- 4,298
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines90%1,821 flights
- 2.Alaska Airlines76%566 flights
- 3.Frontier Airlines75%338 flights
- 4.Southwest Airlines73%1,573 flights
What the data says
Morning flights do better here.
PDX–DEN flights departing between 3–6 AM arrived on time 96% of the time, versus 67% between 9 PM–12 AM.
Saturday comes out ahead.
A small edge: 85% on time on Saturdays against 78% on Thursdays.
United Airlines has a clear lead on this route.
United Airlines arrived on time 90% of the time on this route; Southwest Airlines managed 73%.
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
- Mon80%(648 flights)
- Tue79%(559 flights)
- Wed79%(574 flights)
- Thu78%(645 flights)
- Fri80%(651 flights)
- Sat85%(532 flights)
- Sun85%(645 flights)
- 3–6 AM96%(556 flights)
- 6–9 AM89%(1206 flights)
- 9 AM–12 PM81%(399 flights)
- 12–3 PM72%(1096 flights)
- 3–6 PM70%(627 flights)
- 6–9 PM79%(355 flights)
- 9 PM–12 AM67%(15 flights)
Jun 71% → May 85% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 71% | 433 |
| July 2025 | 65% | 447 |
| August 2025 | 76% | 430 |
| September 2025 | 79% | 393 |
| October 2025 | 87% | 395 |
| November 2025 | 90% | 336 |
| December 2025 | 77% | 344 |
| January 2026 | 89% | 269 |
| February 2026 | 88% | 244 |
| March 2026 | 89% | 293 |
| April 2026 | 88% | 303 |
| May 2026 | 85% | 367 |
Keep nerding
Based on 4,298 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.