Best Time to Fly SLC to ORD: On-Time Stats by Hour & Airline
Salt Lake City International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.0% of Salt Lake City (SLC) to Chicago (ORD) flights arrived on time (3,205 scheduled flights). That is 1.7 points below the national average of 77.6%.
Delta Air Lines was the most punctual of the 5 airlines on the route at 77.3%, while Envoy Air trailed at 61.1%.
September has been the best month (86% on time) and Thursday the weakest day of the week (76%).
1.5% of flights were cancelled, versus 1.8% nationally.
SLC to ORD 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 | 77.3% | 70 min | 0.9% | 1,012 |
| American Airlines | 75.9% | 107 min | 2.0% | 1,002 |
| United Airlines | 75.4% | 89 min | 1.6% | 1,070 |
| SkyWest Airlines | 73.5% | 101 min | 2.4% | 85 |
| Envoy Air | 61.1% | 80 min | 0.0% | 36 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to ORD
On-time arrival % by scheduled departure hour (local time), 6,332 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.8% | 1.7% | 60 |
| 6am–7am | 89.2% | 0.9% | 440 |
| 7am–8am | 86.7% | 0.6% | 633 |
| 8am–9am | 85.0% | 0.9% | 1,015 |
| 9am–10am | 80.2% | 0.0% | 101 |
| 10am–11am | 80.2% | 1.2% | 82 |
| 11am–12pm | 83.2% | 0.5% | 192 |
| 12pm–1pm | 80.0% | 0.8% | 744 |
| 1pm–2pm | 73.1% | 0.6% | 901 |
| 2pm–3pm | 66.0% | 0.8% | 400 |
| 3pm–4pm | 77.4% | 0.0% | 53 |
| 4pm–5pm | 68.0% | 1.4% | 716 |
| 5pm–6pm | 70.9% | 1.2% | 906 |
| 6pm–7pm | Limited data | 16 | |
| 7pm–8pm | Limited data | 15 | |
| 8pm–9pm | 81.2% | 2.0% | 49 |
| 9pm–10pm | Limited data | 4 | |
| 11pm–12am | Limited data | 5 | |
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 ORD
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) | 66.7% | -12.6 pts | 1.9% | 107 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.7% | +2.4 pts | 0.0% | 257 |
| Summer peak (Jun 15 - Aug 15) | 71.4% | -7.8 pts | 1.4% | 1,081 |
| All other days | 79.3% | — | 0.8% | 4,887 |
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).