Flight number record
UA 356
United Airlines · Chicago to Atlanta
- Route
- ORD → ATL
- Departs
- 14:25
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 356, check with United Airlines.
UA 356 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 358 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so UA 356 runs 4 points behind the country as a whole. Across a thousand flights that is about 42 extra late arrivals.
Key figures
On time
73.1%
Arrivals under 15 minutes late, of 349 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.96%
National rate is 1.89%
1 hour+ late
9.2%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. Beyond the headline rate, 9.2% 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.
Schedule
When UA 356 flies
UA 356 flies ORD to ATL without a single fixed slot. Its most common scheduled departure was 14:25, used on 89 of 358 flights, with 14:30 (88 flights) and 13:55 (71 flights) next.
- Departs 14:2589 flights24.9%
- Departs 14:3088 flights24.6%
- Departs 13:5571 flights19.8%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 14:25 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 356 runs level with that at 73.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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.
Against the route
UA 356 next to ORD to ATL
Every carrier on ORD to ATL combined arrived on time 74.1% of the time across 6,495 flights, so UA 356 is about level with it. United flew 1,717 flights on the same city pair under all its flight numbers, including this one, and those ran 74.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 356thin sample | 358 | 73.1% | 64 min | 1.96% | C |
| All United Airlines on ORD–ATL | 1,717 | 74.5% | 67 min | 1.34% | C |
| All carriers on ORD–ATL | 6,495 | 74.1% | 81 min | 2.31% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 356 quarter by quarter
UA 356 did not run the same all year. Its best quarter was Jan–Mar 2026 at 75.0% on time and its weakest Jul–Sep 2026 at 63.3%, a swing of 12 points on roughly 90 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 202530 flights—
- Oct–Dec 202589 flights72.1%
- Jan–Mar 202686 flights75.0%
- Apr–Jun 202691 flights74.4%
- Jul–Sep 202662 flights63.3%
Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, UA 356 did best on Tuesday at 90.2% on time and worst on Sunday at 64.7%. Each day rests on about 51 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 356 runs when it is late
The 94 late arrivals split 26 under half an hour, 36 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early72 flights20.6%
- Within 15 min183 flights52.4%
- 15–29 min late26 flights7.4%
- 30–59 min late36 flights10.3%
- 1–2 hours late18 flights5.2%
- 2+ hours late14 flights4.0%
Scale runs 0% to 100%.
Share of 349 completed flights by arrival against schedule.
20 of 90 late departures made up the time and arrived on time, 22% of them. In the other direction, 24 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 ATL.
The worst days
Worst days for UA 356
The latest arrival of the period was on 11 August 2026, 3 hours 51 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 August 2026 | 3 hours 51 minutes | Late-arriving aircraft |
| 6 May 2026 | 3 hours 40 minutes | Carrier |
| 30 November 2025 | 3 hours 21 minutes | Late-arriving aircraft |
| 17 April 2026 | 3 hours 5 minutes | Late-arriving aircraft |
| 7 December 2025 | 3 hours 1 minute | Late-arriving aircraft |
Delay causes
Why UA 356 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,973 reported delay minutes.
- 42%Late-arriving aircraft
- 29%National Airspace System
- 24%Carrier
- 5%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,973 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 5,973 delay minutes reported on UA 356.
Cancellations sit at 1.96% against a national 1.89%, which is ordinary. Diversions add another 0.56%.
Connections and routes
What a delay on this flight costs
9.2% 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 606 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 same number turns up on four other city pairs in the data, including PHX to ORD (198), SJC to ORD (61) and ATL to IAH (26), but none flew often enough under UA 356 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to ATL only.
One caution: this is a thin sample. 358 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 356
For a booking, read UA 356 as 73.1% on time with 1.96% cancelled over 358 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to ATL, every carrier and departure
- ATL to ORD, the return direction
- Delta Air Lines 1264 on the same route91.3%
- Delta Air Lines 1247 on the same route87.8%
- Delta Air Lines 1147 on the same route79.3%
- Delta Air Lines 1178 on the same route85.4%
- Frontier Airlines 1596 on the same route72.4%
- United Airlines 1398 on the same route56.2%
- Chicago O'Hare International (ORD) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.