Carrier route record
UAORD→BTV
United Airlines · Chicago to Burlington
- Flights
- 684
- Period
- September 2025 to August 2026
- Share of route
- 53%
- 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 BTV sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 684 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 BTV runs 7 points behind the country as a whole. Across a thousand flights that is about 72 extra late arrivals.
Key figures
On time
70.1%
Arrivals under 15 minutes late, of 675 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
0.44%
National rate is 1.89%
Whole route
68.5%
Every carrier on ORD to BTV, 1,282 flights
These figures cover 684 flights between September 2025 and August 2026. Beyond the headline rate, 10.4% 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 BTV
United flew 684 of the 1,282 flights on ORD to BTV, most of the route. Its 70.1% on time is 2 points better than the route as a whole, which runs 68.5%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from Envoy at 82.1% to SkyWest at 64.3%. 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 |
|---|---|---|---|---|---|
| Envoy Airthin sample | 67 | 82.1% | 34 min | 0.00% | B+ |
| Republic Airwaysthin sample | 20 | 73.7% | 49 min | 5.00% | C− |
| United Airlines (this page) | 684 | 70.1% | 65 min | 0.44% | C+ |
| SkyWest Airlines | 511 | 64.3% | 88 min | 4.31% | D− |
Flight by flight
United flight numbers on ORD to BTV
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 20 points, against half a point between the best and worst carrier.
- 5am–8am19 flights—
- 8am–11am—
- 11am–2pm311 flights79.9%
- 2pm–5pm3 flights—
- 5pm–8pm351 flights60.1%
- 8pm–5am—
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 60.1% on time, against 79.9% for the 11am–2pm 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 5pm–8pm window is the busiest, with 351 flights scheduled in it.
Across the year
United on ORD to BTV through the year
August is the worst month at 57.4% on time, 27 points below October, the best at 83.9%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 62 flights.
Across the week, Tuesday is the strongest day at 72.3% on time and Monday the weakest at 67.3%, a spread of 5 points.
Arrival by arrival
How late United on ORD to BTV runs when it is late
The 202 late arrivals split 73 under half an hour, 59 between 30 and 60 minutes, and 70 an hour or more.
- 15+ min early100 flights14.8%
- Within 15 min373 flights55.3%
- 15–29 min late73 flights10.8%
- 30–59 min late59 flights8.7%
- 1–2 hours late42 flights6.2%
- 2+ hours late28 flights4.1%
Scale runs 0% to 100%.
Share of 675 completed flights by arrival against schedule.
28 of 165 late departures made up the time and arrived on time, 17% of them. In the other direction, 65 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 BTV.
The worst days
Worst days for United on ORD to BTV
The latest arrival of the period was on 28 July 2026, 6 hours 39 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across July, June, November and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 July 2026 | 6 hours 39 minutes | Carrier |
| 27 July 2026 | 6 hours 30 minutes | Late-arriving aircraft |
| 24 June 2026 | 5 hours 10 minutes | Extreme weather |
| 30 November 2025 | 4 hours | Carrier |
| 12 August 2026 | 3 hours 44 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
Late-arriving aircraft accounts for 49% of the 13,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 23%Carrier
- 21%National Airspace System
- 7%Extreme weather
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 13,129 reported delay minutes.
Cancellations are rare at 0.44%, 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
10.4% 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 763 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 runs 70.5% on time across 684 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 684 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 BTV
Put together: treat all of this as provisional. 684 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 70.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 675 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to BTV, every carrier
- United on BTV to ORD, the return leg
- SkyWest Airlines on ORD to BTV64.3%
- United Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.