Flight number record
UA 1693
United Airlines · Chicago to Boston
- Route
- ORD → BOS
- Departs
- 13:55
- Flights
- 278
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1693, check with United Airlines.
UA 1693 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 278 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.6%, so UA 1693 runs 14 points behind the country as a whole. Across a thousand flights that is about 139 extra late arrivals.
Key figures
On time
63.7%
Arrivals under 15 minutes late, of 270 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
2.52%
National rate is 1.81%
1 hour+ late
16.7%
National rate is 8.1%
These figures cover 278 flights between July 2025 and June 2026. Beyond the headline rate, 16.7% 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 1693 flies
UA 1693 flies ORD to BOS without a single fixed slot. Its most common scheduled departure was 13:55, used on 213 of 278 flights, with 14:20 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 13:55213 flights76.6%
- Departs 14:2031 flights11.2%
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 13:55 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1693 runs 15 points worse at 63.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1693 next to ORD to BOS
Every carrier on ORD to BOS combined arrived on time 67.6% of the time across 7,642 flights, so UA 1693 is 4 points behind it. United flew 2,680 flights on the same city pair under all its flight numbers, including this one, and those ran 68.6% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1693thin sample | 278 | 63.7% | 77 min | 2.52% | D |
| All United Airlines on ORD–BOS | 2,680 | 68.6% | 78 min | 1.87% | C |
| All carriers on ORD–BOS | 7,642 | 67.6% | 78 min | 2.79% | C |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1693 quarter by quarter
UA 1693 did not run the same all year. Its best quarter was Jan–Mar 2026 at 73.3% on time and its weakest Oct–Dec 2025 at 57.3%, a swing of 16 points on roughly 93 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 20256 flights—
- Oct–Dec 202591 flights57.3%
- Jan–Mar 202690 flights73.3%
- Apr–Jun 202691 flights62.9%
Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1693 did best on Saturday at 84.6% on time and worst on Thursday at 55.3%. Each day rests on about 40 flights, so a gap of 29 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1693 runs late
One category carries most of the weight here. National Airspace System accounts for 55% of the 7,571 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.
- 55%National Airspace System
- 31%Late-arriving aircraft
- 10%Carrier
- 4%Extreme weather
55% 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 4,126 minutes out of 7,571, against a national NAS share of 21%. The split is drawn from 7,571 delay minutes reported on UA 1693.
Cancellations run at 2.52%, against 1.81% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
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. 16.7% 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 867 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 eight other city pairs in the data, including BZN to ORD (142), BOS to EWR (101) and PDX to ORD (68), but none flew often enough under UA 1693 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to BOS only.
One caution: this is a thin sample. 278 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 1693
For a booking, the cancellation rate is the figure to plan around on UA 1693: 2.52% of its 278 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ORD to BOS, every carrier and departure
- BOS to ORD, the return direction
- JetBlue Airways 312 on the same route74.2%
- United Airlines 2067 on the same route91.1%
- Chicago O'Hare International (ORD) delay statistics
- Boston Logan International (BOS) 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.