Flight Reliability
F9 1789 · Frontier Airlines
Denver → Portland (DEN–PDX)
92
Nerd Approved
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 0%
- Cancelled
- 9 min early
- Median arrival delay
Based on 82 historical flights. Data through May 2026.
What the data says
The 9 AM–12 PM departure wins.
F9 1789 departing between 9 AM–12 PM arrived on time 89% of the time, versus 80% between 6–9 AM.
Mondays have been rough.
F9 1789 arrived on time 100% of the time on Sundays and just 64% on Mondays. That gap is worth planning around.
Better than the DEN–PDX route average.
F9 1789 arrived on time 84% of the time, versus 75% across the DEN–PDX route.
Better than the Frontier Airlines network average.
F9 1789 arrived on time 84% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon64%(14 flights)
- Tue—(9 flights)
- Wed—(9 flights)
- Thu85%(13 flights)
- Fri77%(13 flights)
- Sat80%(10 flights)
- Sun100%(14 flights)
- 6–9 AM80%(46 flights)
- 9 AM–12 PM89%(36 flights)
76%
Aug
Jun 84% → Aug 76% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 84% | 25 |
| July 2025 | 90% | 31 |
| August 2025 | 76% | 25 |
- Departures on time
- 79%
- Diverted
- 0%
- Flights flown
- 82
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 82 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.