Flight number record
UA 2106
United Airlines · Miami to Chicago
- Route
- MIA → ORD
- Departs
- 16:16
- Flights
- 336
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2106, check with United Airlines.
UA 2106 earns a D+, which is as low as this site's scale goes for a reason. Only 57.2% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.6%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 336 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.6%, so UA 2106 runs 20 points behind the country as a whole. Across a thousand flights that is about 204 extra late arrivals.
Key figures
On time
57.2%
Arrivals under 15 minutes late, of 332 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
0.30%
National rate is 1.81%
1 hour+ late
15.7%
National rate is 8.1%
These figures cover 336 flights between July 2025 and June 2026. Beyond the headline rate, 15.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When UA 2106 flies
UA 2106 flies MIA to ORD without a single fixed slot. Its most common scheduled departure was 16:16, used on 85 of 336 flights, with 16:06 (51 flights) and 16:10 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 16:1685 flights25.3%
- Departs 16:0651 flights15.2%
- Departs 16:1045 flights13.4%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:16 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 2106 runs 15 points worse at 57.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 2106 next to MIA to ORD
Every carrier on MIA to ORD combined arrived on time 70.8% of the time across 4,447 flights, so UA 2106 is 14 points behind it. United flew 1,040 flights on the same city pair under all its flight numbers, including this one, and those ran 70.7% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 22 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2106thin sample | 336 | 57.2% | 83 min | 0.30% | D+ |
| All United Airlines on MIA–ORD | 1,040 | 70.7% | 85 min | 0.87% | C+ |
| All carriers on MIA–ORD | 4,447 | 70.8% | 75 min | 1.96% | C |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 2106 quarter by quarter
UA 2106 did not run the same all year. Its best quarter was Apr–Jun 2026 at 67.4% on time and its weakest Jul–Sep 2025 at 49.3%, a swing of 18 points on roughly 84 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202574 flights49.3%
- Oct–Dec 202581 flights55.6%
- Jan–Mar 202690 flights55.1%
- Apr–Jun 202691 flights67.4%
Scale runs 40% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2106 did best on Wednesday at 70.5% on time and worst on Friday at 46.9%. Each day rests on about 48 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2106 runs late
One category carries most of the weight here. National Airspace System accounts for 51% of the 12,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 51%National Airspace System
- 32%Late-arriving aircraft
- 10%Extreme weather
- 7%Carrier
51% 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 6,032 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 11,776 delay minutes reported on UA 2106.
Cancellations are rare at 0.30%, below the national 1.81% 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 routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 15.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 1,197 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on five other city pairs in the data, including ORD to SFO (188), PIT to ORD (18) and ORD to BOS (17), but none flew often enough under UA 2106 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MIA to ORD only.
One caution: this is a thin sample. 336 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 UA 2106
For a booking, UA 2106 is a flight to put a long connection behind. 15.7% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- MIA to ORD, every carrier and departure
- ORD to MIA, the return direction
- United Airlines 1983 on the same route79.4%
- Miami International (MIA) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.