Best Time to Fly ORD to BIS: On-Time Stats by Hour & Airline
Chicago O'Hare International → Bismarck Municipal
Data through July 2026 · Last updated October 18, 2026
274 flights were scheduled from Chicago (ORD) to Bismarck/Mandan (BIS) in the last 12 months, and 86.8% of those that flew arrived on time, 9.2 points above the US average of 77.6%.
Envoy Air was the only reporting airline with regular flights on this route.
Over 24 months, Monday was the most reliable day (87% on time) and December the worst month (70%).
The cancellation rate was 0.0% (US average 1.8%).
ORD to BIS 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 | 86.6% | 69 min | 0.0% | 270 |
| SkyWest Airlines | Limited data | 4 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to BIS
On-time arrival % by scheduled departure hour (local time), 331 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 2 | |
| 9am–10am | 83.6% | 0.0% | 196 |
| 10am–11am | 85.7% | 0.0% | 133 |
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 BIS
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) | 83.5% | -3.5 pts | 0.0% | 109 |
| All other days | 87.0% | — | 0.0% | 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).