Carrier route record
UABTV→ORD
United Airlines · Burlington to Chicago
- 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 BTV to ORD 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 an hour and a half behind schedule. That rests on 684 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so United on BTV to ORD runs 7 points behind the country as a whole. Across a thousand flights that is about 68 extra late arrivals.
Key figures
On time
70.5%
Arrivals under 15 minutes late, of 679 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
0.73%
National rate is 1.89%
Whole route
68.3%
Every carrier on BTV to ORD, 1,282 flights
These figures cover 684 flights between September 2025 and August 2026. Beyond the headline rate, 8.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
United against every carrier on BTV to ORD
United flew 684 of the 1,282 flights on BTV to ORD, most of the route. Its 70.5% on time is 2 points better than the route as a whole, which runs 68.3%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from Republic at 72.2% to Envoy at 64.2%. 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 |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 20 | 72.2% | 67 min | 10.00% | C− |
| United Airlines (this page) | 684 | 70.5% | 82 min | 0.73% | C+ |
| SkyWest Airlines | 511 | 65.5% | 111 min | 3.72% | C− |
| Envoy Airthin sample | 67 | 64.2% | 69 min | 0.00% | D+ |
Flight by flight
United flight numbers on BTV to ORD
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 36 points, against half a point between the best and worst carrier.
- 5am–8am318 flights82.3%
- 8am–11am37 flights86.5%
- 11am–2pm19 flights—
- 2pm–5pm158 flights62.4%
- 5pm–8pm152 flights50.3%
- 8pm–5am—
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 50.3% on time, against 86.5% 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 5am–8am window is the busiest, with 318 flights scheduled in it.
Across the year
United on BTV to ORD through the year
September is the best month on the calendar at 83.3% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 62 flights.
Across the week, Friday is the strongest day at 72.0% on time and Sunday the weakest at 67.7%, a spread of 4 points.
Arrival by arrival
How late United on BTV to ORD runs when it is late
The 200 late arrivals split 76 under half an hour, 64 between 30 and 60 minutes, and 60 an hour or more.
- 15+ min early158 flights23.3%
- Within 15 min321 flights47.3%
- 15–29 min late76 flights11.2%
- 30–59 min late64 flights9.4%
- 1–2 hours late26 flights3.8%
- 2+ hours late34 flights5.0%
Scale runs 0% to 100%.
Share of 679 completed flights by arrival against schedule.
16 of 117 late departures made up the time and arrived on time, 14% of them. In the other direction, 99 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 ORD.
The worst days
Worst days for United on BTV to ORD
The latest arrival of the period was on 8 November 2025, 17 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in June 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 November 2025 | 17 hours 15 minutes | Carrier |
| 17 June 2026 | 17 hours 14 minutes | Carrier |
| 27 April 2026 | 16 hours 48 minutes | Extreme weather |
| 10 June 2026 | 15 hours 47 minutes | National Airspace System |
| 11 June 2026 | 5 hours 59 minutes | National Airspace System |
Delay causes
Why United runs late on this route
National Airspace System accounts for 52% of the 16,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%National Airspace System
- 32%Carrier
- 8%Late-arriving aircraft
- 7%Extreme weather
52% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 8,575 minutes out of 16,000, against a national NAS share of 21%. The split is drawn from 16,488 reported delay minutes.
Cancellations are rare at 0.73%, 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
8.8% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
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 70.1% 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 BTV to ORD
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 70.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 679 completed flights over 12 months sit behind that.
Related
Where to go next
- BTV to ORD, every carrier
- United on ORD to BTV, the return leg
- SkyWest Airlines on BTV to ORD65.5%
- United Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- Connecting flights: how much buffer the data says you need
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.