Flight number record
UA 1844
United Airlines · Newark to San Francisco
- Route
- EWR → SFO
- Departs
- 18:00
- Flights
- 326
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1844, check with United Airlines.
UA 1844 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 326 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so UA 1844 runs 17 points behind the country as a whole. Across a thousand flights that is about 166 extra late arrivals.
Key figures
On time
60.7%
Arrivals under 15 minutes late, of 318 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
2.45%
National rate is 1.89%
1 hour+ late
14.8%
National rate is 8.3%
These figures cover 326 flights between September 2025 and August 2026. Beyond the headline rate, 14.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1844 flies
UA 1844 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 18:00, used on 256 of 326 flights.
- Departs 18:00256 flights78.5%
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 18:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1844 runs 7 points worse at 60.7%. 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 1844 next to EWR to SFO
Every carrier on EWR to SFO combined arrived on time 67.9% of the time across 4,349 flights, so UA 1844 is 7 points behind it. United flew 3,863 flights on the same city pair under all its flight numbers, including this one, and those ran 66.7% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1844thin sample | 326 | 60.7% | 76 min | 2.45% | D |
| All United Airlines on EWR–SFO | 3,863 | 66.7% | 90 min | 2.43% | C |
| All carriers on EWR–SFO | 4,349 | 67.9% | 88 min | 2.30% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1844 quarter by quarter
UA 1844 did not run the same all year. Its best quarter was Jan–Mar 2026 at 67.8% on time and its weakest Jul–Sep 2026 at 39.5%, a swing of 28 points on roughly 82 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 flights64.8%
- Jan–Mar 202690 flights67.8%
- Apr–Jun 202691 flights58.2%
- Jul–Sep 202648 flights39.5%
Scale runs 30% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1844 did best on Tuesday at 82.2% on time and worst on Sunday at 44.4%. Each day rests on about 47 flights, so a gap of 38 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1844 runs when it is late
The 125 late arrivals split 34 under half an hour, 44 between 30 and 60 minutes, and 47 an hour or more.
- 15+ min early66 flights20.8%
- Within 15 min127 flights39.9%
- 15–29 min late34 flights10.7%
- 30–59 min late44 flights13.8%
- 1–2 hours late26 flights8.2%
- 2+ hours late21 flights6.6%
Scale runs 0% to 100%.
Share of 318 completed flights by arrival against schedule.
22 of 110 late departures made up the time and arrived on time, 20% of them. In the other direction, 37 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 1844
The latest arrival of the period was on 28 July 2026, 13 hours 3 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across July, November, December, January and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 July 2026 | 13 hours 3 minutes | Extreme weather |
| 2 November 2025 | 6 hours 8 minutes | Late-arriving aircraft |
| 14 December 2025 | 4 hours 56 minutes | Late-arriving aircraft |
| 5 January 2026 | 3 hours 50 minutes | National Airspace System |
| 20 May 2026 | 3 hours 50 minutes | National Airspace System |
Delay causes
Why UA 1844 runs late
National Airspace System accounts for 51% of the 9,544 delay minutes carriers reported here, and the remaining four split what is left.
- 51%National Airspace System
- 23%Carrier
- 17%Late-arriving aircraft
- 9%Extreme weather
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 4,846 minutes out of 9,544, against a national NAS share of 21%. The split is drawn from 9,544 delay minutes reported on UA 1844.
Cancellations sit at 2.45% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
14.8% 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 2,565 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.
The same number turns up on six other city pairs in the data, including MSY to EWR (37), ATL to EWR (29) and EWR to CLE (24), but none flew often enough under UA 1844 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to SFO only.
One caution: this is a thin sample. 326 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 1844
For a booking, UA 1844 is a flight to put a long connection behind. 14.8% 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
- EWR to SFO, every carrier and departure
- SFO to EWR, the return direction
- United Airlines 1777 on the same route72.5%
- United Airlines 648 on the same route70.9%
- United Airlines 2328 on the same route65.4%
- United Airlines 1343 on the same route64.1%
- United Airlines 2115 on the same route83.2%
- United Airlines 1227 on the same route69.3%
- Newark Liberty International (EWR) 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.