Flight Reliability
F9 4278 · Frontier Airlines
Las Vegas → Washington (LAS–IAD)
82
Pretty Reliable
WanderNerd Reliability Score
- 74%
- Arrive within 15 minutes
- 11 min
- Average arrival delay
- 0%
- Cancelled
- 1 min early
- Median arrival delay
Based on 93 historical flights. Data through May 2026.
What the data says
Morning-you made the right choice.
F9 4278 departing between 12–3 AM arrived on time 82% of the time, versus 73% between 9 PM–12 AM.
Friday is doing you no favors.
F9 4278 arrived on time 93% of the time on Wednesdays and just 43% on Fridays. That gap is worth planning around.
Lagging the LAS–IAD route.
F9 4278 arrived on time 74% of the time, versus 87% across the LAS–IAD route.
The breakdown
- Mon91%(11 flights)
- Tue90%(10 flights)
- Wed93%(14 flights)
- Thu47%(15 flights)
- Fri43%(14 flights)
- Sat92%(13 flights)
- Sun75%(16 flights)
- 12–3 AM82%(11 flights)
- 9 PM–12 AM73%(82 flights)
82%
May
Jun 68% → May 82% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 68% | 25 |
| July 2025 | 77% | 31 |
| August 2025 | 73% | 26 |
| May 2026 | 82% | 11 |
- Departures on time
- 77%
- Diverted
- 0%
- Flights flown
- 93
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 93 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.