Best Time to Fly SLC to PHL: On-Time Stats by Hour & Airline
Salt Lake City International → Philadelphia International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.6% of Salt Lake City (SLC) to Philadelphia (PHL) flights arrived on time (818 scheduled flights). That is 7.0 points above the national average of 77.6%.
Among 2 airlines, American Airlines led with 88.5% on time and Delta Air Lines was last with 83.2%.
Over 24 months, Tuesday was the most reliable day (91% on time) and March the worst month (78%).
The cancellation rate was 2.1% (US average 1.8%).
SLC to PHL 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 |
|---|---|---|---|---|
| American Airlines | 88.5% | 155 min | 5.0% | 220 |
| Delta Air Lines | 83.2% | 54 min | 1.0% | 598 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to PHL
On-time arrival % by scheduled departure hour (local time), 1,529 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 18 | |
| 1am–2am | Limited data | 13 | |
| 6am–7am | 93.0% | 5.3% | 75 |
| 7am–8am | 85.1% | 6.3% | 79 |
| 8am–9am | 93.0% | 0.0% | 44 |
| 9am–10am | Limited data | 24 | |
| 10am–11am | 81.2% | 2.6% | 115 |
| 11am–12pm | 83.4% | 0.3% | 583 |
| 5pm–6pm | 89.8% | 2.5% | 121 |
| 11pm–12am | 80.7% | 2.6% | 457 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC to PHL
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) | 80.0% | -6.4 pts | 2.4% | 82 |
| Summer peak (Jun 15 - Aug 15) | 78.7% | -7.7 pts | 4.4% | 342 |
| All other days | 86.4% | — | 1.2% | 1,076 |
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).