Flight number record
UA 1757
United Airlines · Washington to San Francisco
- Route
- IAD → SFO
- Departs
- 17:55
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 a little over an hour behind schedule. Build slack into anything you connect to. That rests on 365 flights, with a median arrival 8 minutes late.
The national on-time rate over the same period is 77.3%, so UA 1757 runs 19 points behind the country as a whole. Across a thousand flights that is about 185 extra late arrivals.
Key figures
On time
58.8%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.89%
1 hour+ late
15.7%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 15.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 132 of 365 flights, with 18:03 (61 flights) and 18:15 (37 flights) next.
- Departs 17:55132 flights36.2%
- Departs 18:0361 flights16.7%
- Departs 18:1537 flights10.1%
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 17:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1757 runs 9 points worse at 58.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 1757 next to IAD to SFO
Every carrier on IAD to SFO combined arrived on time 77.5% of the time across 2,688 flights, so UA 1757 is 19 points behind it. Across its whole network United Airlines managed 78.8%, which this flight trails by 20 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1757 | 365 | 58.8% | 79 min | 1.92% | D |
| All United Airlines on IAD–SFO | 2,688 | 77.5% | 72 min | 0.71% | B+ |
| All carriers on IAD–SFO | 2,688 | 77.5% | 72 min | 0.71% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 2026 at 46.8%, a swing of 29 points on roughly 73 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 flights50.0%
- Oct–Dec 202592 flights61.8%
- Jan–Mar 202690 flights75.6%
- Apr–Jun 202691 flights51.1%
- Jul–Sep 202662 flights46.8%
Scale runs 40% to 80%.
By weekday, UA 1757 did best on Tuesday at 75.0% on time and worst on Friday at 49.0%. Each day rests on about 52 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1757 runs when it is late
The 147 late arrivals split 47 under half an hour, 44 between 30 and 60 minutes, and 56 an hour or more.
- 15+ min early71 flights19.9%
- Within 15 min139 flights38.9%
- 15–29 min late47 flights13.2%
- 30–59 min late44 flights12.3%
- 1–2 hours late25 flights7.0%
- 2+ hours late31 flights8.7%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
19 of 119 late departures made up the time and arrived on time, 16% of them. In the other direction, 47 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 SFO.
The worst days
Worst days for UA 1757
The latest arrival of the period was on 1 June 2026, 6 hours 45 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across June, July, March and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 June 2026 | 6 hours 45 minutes | Late-arriving aircraft |
| 4 July 2026 | 5 hours 30 minutes | Extreme weather |
| 14 March 2026 | 5 hours 12 minutes | Carrier |
| 29 October 2025 | 5 hours 1 minute | Late-arriving aircraft |
| 5 July 2026 | 4 hours 59 minutes | National Airspace System |
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.
- 41%National Airspace System
- 26%Late-arriving aircraft
- 23%Carrier
- 10%Extreme weather
41% 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 4,721 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 11,615 delay minutes reported on UA 1757.
Cancellations sit at 1.92% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
15.7% 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.
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 (272 flights, 62.7% 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 | 272 | 62.7% | 52 min | 0.37% | D+ |
What to do with this
Booking UA 1757
For a booking, UA 1757 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
- IAD to SFO, every carrier and departure
- SFO to IAD, the return direction
- United Airlines 2862 on the same route80.8%
- United Airlines 367 on the same route82.6%
- United Airlines 1434 on the same route77.4%
- United Airlines 1095 on the same route85.0%
- 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
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.