Carrier route record
UAORD→BZN
United Airlines · Chicago to Bozeman
- Flights
- 720
- Period
- September 2025 to August 2026
- Share of route
- 58%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on ORD to BZN sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 720 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so United on ORD to BZN runs 6 points behind the country as a whole. Across a thousand flights that is about 57 extra late arrivals.
Key figures
On time
71.6%
Arrivals under 15 minutes late, of 714 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
Whole route
68.2%
Every carrier on ORD to BZN, 1,252 flights
These figures cover 720 flights between September 2025 and August 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
United against every carrier on ORD to BZN
United flew 720 of the 1,252 flights on ORD to BZN, most of the route. Its 71.6% on time is 3 points better than the route as a whole, which runs 68.2%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from United at 71.6% to Envoy at 55.0%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines (this page) | 720 | 71.6% | 70 min | 0.56% | C+ |
| SkyWest Airlinesthin sample | 46 | 68.9% | 70 min | 0.00% | C+ |
| American Airlines | 445 | 63.9% | 64 min | 0.67% | D+ |
| Envoy Airthin sample | 41 | 55.0% | 31 min | 0.00% | D+ |
Flight by flight
United flight numbers on ORD to BZN
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 32 points, against half a point between the best and worst carrier.
- 5am–8am1 flights—
- 8am–11am365 flights78.8%
- 11am–2pm122 flights73.8%
- 2pm–5pm79 flights63.3%
- 5pm–8pm32 flights46.9%
- 8pm–5am121 flights59.0%
Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 46.9% on time, against 78.8% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 365 flights scheduled in it.
Across the year
United on ORD to BZN through the year
December is the weak month at 56.9% on time, against 82.2% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. August was the busiest month here, with 93 flights.
Across the week, Tuesday is the strongest day at 75.8% on time and Friday the weakest at 67.6%, a spread of 8 points.
Arrival by arrival
How late United on ORD to BZN runs when it is late
The 203 late arrivals split 56 under half an hour, 78 between 30 and 60 minutes, and 69 an hour or more.
- 15+ min early136 flights19.0%
- Within 15 min375 flights52.5%
- 15–29 min late56 flights7.8%
- 30–59 min late78 flights10.9%
- 1–2 hours late37 flights5.2%
- 2+ hours late32 flights4.5%
Scale runs 0% to 100%.
Share of 714 completed flights by arrival against schedule.
35 of 178 late departures made up the time and arrived on time, 20% of them. In the other direction, 60 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BZN.
The worst days
Worst days for United on ORD to BZN
The latest arrival of the period was on 28 July 2026, 9 hours 4 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 July 2026 | 9 hours 4 minutes | National Airspace System |
| 7 December 2025 | 5 hours 31 minutes | Late-arriving aircraft |
| 13 August 2026 | 5 hours 9 minutes | Carrier |
| 18 May 2026 | 4 hours 34 minutes | Late-arriving aircraft |
| 31 August 2026 | 4 hours 21 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
Late-arriving aircraft accounts for 52% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 23%National Airspace System
- 21%Carrier
- 4%Extreme weather
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 14,000 reported delay minutes here, that single category outweighs weather by 13 to one. The split is drawn from 14,125 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 78.8% on time here.
Cancellations are rare at 0.56%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,185 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 77.6% on time across 720 flights, 6 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
One caution: this is a thin sample. 720 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking United on ORD to BZN
Put together: treat all of this as provisional. 720 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 71.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 714 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to BZN, every carrier
- United on BZN to ORD, the return leg
- American Airlines on ORD to BZN63.9%
- United Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- Flying to ski country: which routes into the mountains run on time
- Why the first flight of the morning is statistically safest
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.