Best Time to Fly BIS to ORD: On-Time Stats by Hour & Airline
Bismarck Municipal → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
274 flights were scheduled from Bismarck/Mandan (BIS) to Chicago (ORD) in the last 12 months, and 78.6% of those that flew arrived on time, 1.0 points above the US average of 77.6%.
Envoy Air was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (81% on time) and July the worst month (60%).
The cancellation rate was 0.4% (US average 1.8%).
BIS 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 |
|---|---|---|---|---|
| Envoy Air | 78.7% | 97 min | 0.4% | 270 |
| SkyWest Airlines | Limited data | 4 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BIS to ORD
On-time arrival % by scheduled departure hour (local time), 331 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 11am–12pm | Limited data | 2 | |
| 12pm–1pm | 72.7% | 0.5% | 184 |
| 1pm–2pm | 75.0% | 0.0% | 145 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BIS 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) | Limited data | 7 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 15 | ||
| Summer peak (Jun 15 - Aug 15) | 68.2% | -10.2 pts | 0.0% | 109 |
| All other days | 78.4% | — | 0.5% | 200 |
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).