Best Time to Fly ORD to SLC: On-Time Stats by Hour & Airline
Chicago O'Hare International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
3,204 flights were scheduled from Chicago (ORD) to Salt Lake City (SLC) in the last 12 months, and 69.8% of those that flew arrived on time, 7.8 points below the US average of 77.6%.
Among 5 airlines, United Airlines led with 72.5% on time and Envoy Air was last with 61.1%.
Over 24 months, Tuesday was the most reliable day (78% on time) and June the worst month (65%).
The cancellation rate was 1.4% (US average 1.8%).
ORD 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 |
|---|---|---|---|---|
| United Airlines | 72.5% | 64 min | 1.2% | 1,070 |
| Delta Air Lines | 72.3% | 108 min | 1.0% | 1,013 |
| SkyWest Airlines | 67.9% | 90 min | 1.2% | 82 |
| American Airlines | 64.9% | 69 min | 2.1% | 1,003 |
| Envoy Air | 61.1% | 48 min | 0.0% | 36 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to SLC
On-time arrival % by scheduled departure hour (local time), 6,332 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 5 | |
| 7am–8am | 82.4% | 0.5% | 804 |
| 8am–9am | 86.3% | 0.0% | 410 |
| 9am–10am | 79.8% | 0.5% | 778 |
| 10am–11am | 73.3% | 0.4% | 521 |
| 11am–12pm | Limited data | 8 | |
| 12pm–1pm | 78.7% | 0.4% | 476 |
| 1pm–2pm | 72.8% | 0.6% | 854 |
| 2pm–3pm | 72.0% | 0.4% | 231 |
| 3pm–4pm | 72.2% | 1.4% | 73 |
| 4pm–5pm | 52.1% | 0.5% | 188 |
| 5pm–6pm | 69.3% | 0.3% | 373 |
| 6pm–7pm | 67.3% | 1.8% | 113 |
| 7pm–8pm | 63.8% | 1.5% | 1,045 |
| 8pm–9pm | 59.4% | 1.9% | 379 |
| 9pm–10pm | 50.0% | 6.7% | 60 |
| 10pm–11pm | Limited data | 14 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD 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) | 62.5% | -12.4 pts | 1.9% | 106 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.4% | -6.6 pts | 0.4% | 257 |
| Summer peak (Jun 15 - Aug 15) | 65.7% | -9.3 pts | 1.2% | 1,079 |
| All other days | 74.9% | — | 0.7% | 4,890 |
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).