Flight Reliability
F9 1856 · Frontier Airlines
San Diego → Chicago (SAN–ORD)
0
Bring Snacks
WanderNerd Reliability Score
- 32%
- Arrive within 15 minutes
- 93 min
- Average arrival delay
- 2.5%
- Cancelled
- 39 min
- Median arrival delay
Based on 80 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
F9 1856 arrived on time 60% of the time on Saturdays and just 18% on Sundays. That gap is worth planning around.
Well behind the SAN–ORD route.
F9 1856 arrived on time 32% of the time, versus 79% across the SAN–ORD route.
Well behind the Frontier Airlines network.
F9 1856 arrived on time 32% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon25%(12 flights)
- Tue—(9 flights)
- Wed—(9 flights)
- Thu29%(14 flights)
- Fri31%(13 flights)
- Sat60%(10 flights)
- Sun18%(11 flights)
54%
Aug
Jun 11% → Aug 54% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 11% | 18 |
| July 2025 | 23% | 31 |
| August 2025 | 54% | 24 |
- Departures on time
- 31%
- Diverted
- 0%
- Flights flown
- 78
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 80 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.