Best Time to Fly PHL to SLC: On-Time Stats by Hour & Airline
Philadelphia International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.2% of Philadelphia (PHL) to Salt Lake City (SLC) flights arrived on time (818 scheduled flights). That is 0.6 points above the national average of 77.6%.
Among 2 airlines, Delta Air Lines led with 80.0% on time and American Airlines was last with 73.2%.
Over 24 months, Wednesday was the most reliable day (80% on time) and December the worst month (64%).
The cancellation rate was 2.1% (US average 1.8%).
PHL to SLC on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 80.0% | 63 min | 1.2% | 598 |
| American Airlines | 73.2% | 114 min | 4.5% | 220 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHL to SLC
On-time arrival % by scheduled departure hour (local time), 1,528 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 77.6% | 1.5% | 68 |
| 7am–8am | 84.7% | 1.2% | 660 |
| 2pm–3pm | Limited data | 2 | |
| 4pm–5pm | Limited data | 3 | |
| 5pm–6pm | Limited data | 17 | |
| 6pm–7pm | 74.6% | 1.2% | 497 |
| 7pm–8pm | 61.8% | 6.4% | 235 |
| 8pm–9pm | 50.0% | 2.9% | 35 |
| 9pm–10pm | Limited data | 11 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PHL to SLC
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 29 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 59.5% | -23.1 pts | 3.7% | 82 |
| Summer peak (Jun 15 - Aug 15) | 63.7% | -18.9 pts | 4.1% | 343 |
| All other days | 82.6% | — | 1.4% | 1,074 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).