Flight number record
UA 1757
United Airlines · Washington to San Francisco
- Route
- IAD → SFO
- Departs
- 17:55
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1757, check with United Airlines.
UA 1757 draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 365 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.6%, so UA 1757 runs 19 points behind the country as a whole. Across a thousand flights that is about 191 extra late arrivals.
Key figures
On time
58.5%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.81%
1 hour+ late
16.7%
National rate is 8.1%
These figures cover 365 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 1757 flies
UA 1757 flies IAD to SFO without a single fixed slot. Its most common scheduled departure was 17:55, used on 94 of 365 flights, with 18:03 (61 flights) and 17:53 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 17:5594 flights25.8%
- Departs 18:0361 flights16.7%
- Departs 17:5349 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 17:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1757 runs 10 points worse at 58.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
UA 1757 next to IAD to SFO
Every carrier on IAD to SFO combined arrived on time 78.2% of the time across 2,787 flights, so UA 1757 is 20 points behind it. United flew 2,688 flights on the same city pair under all its flight numbers, including this one, and those ran 78.6% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 21 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1757 | 365 | 58.5% | 84 min | 2.74% | D |
| All United Airlines on IAD–SFO | 2,688 | 78.6% | 74 min | 0.89% | B+ |
| All carriers on IAD–SFO | 2,787 | 78.2% | 74 min | 0.90% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1757 quarter by quarter
UA 1757 did not run the same all year. Its best quarter was Jan–Mar 2026 at 75.6% on time and its weakest Jul–Sep 2025 at 46.1%, a swing of 29 points on roughly 91 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 202592 flights46.1%
- Oct–Dec 202592 flights61.8%
- Jan–Mar 202690 flights75.6%
- Apr–Jun 202691 flights51.1%
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1757 did best on Tuesday at 73.6% on time and worst on Friday at 51.0%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1757 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 12,000 reported delay minutes.
- 36%National Airspace System
- 28%Carrier
- 27%Late-arriving aircraft
- 9%Extreme weather
36% 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 4,409 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 12,278 delay minutes reported on UA 1757.
Cancellations run at 2.74%, against 1.81% nationally. That is roughly 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.
At 2,418 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
UA 1757 is not only a IAD to SFO flight. It also flew SFO to RNO (278 flights, 67.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 365 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SFO to RNOthin sample | 278 | 67.1% | 49 min | 0.36% | C+ |
What to do with this
Booking UA 1757
For a booking, the cancellation rate is the figure to plan around on UA 1757: 2.74% of its 365 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- IAD to SFO, every carrier and departure
- SFO to IAD, the return direction
- United Airlines 2862 on the same route79.9%
- United Airlines 367 on the same route82.5%
- United Airlines 1095 on the same route88.8%
- United Airlines 1434 on the same route78.4%
- Washington Dulles International (IAD) delay statistics
- San Francisco International (SFO) 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
- What a cancellation rate actually tells you (and what it hides)
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.