Flight number record
UA 1844
United Airlines · Newark to San Francisco
- Route
- EWR → SFO
- Departs
- 18:00
- Flights
- 327
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 327 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.6%, so UA 1844 runs 15 points behind the country as a whole. Across a thousand flights that is about 146 extra late arrivals.
Key figures
On time
63.0%
Arrivals under 15 minutes late, of 322 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
1.53%
National rate is 1.81%
1 hour+ late
15.2%
National rate is 8.1%
These figures cover 327 flights between July 2025 and June 2026. Beyond the headline rate, 15.2% 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 1844 flies
UA 1844 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 18:00, used on 208 of 327 flights, with 16:55 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:00208 flights63.6%
- Departs 16:5549 flights15.0%
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 18:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1844 runs 5 points worse at 63.0%. 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 1844 next to EWR to SFO
Every carrier on EWR to SFO combined arrived on time 69.8% of the time across 4,403 flights, so UA 1844 is 7 points behind it. United flew 3,793 flights on the same city pair under all its flight numbers, including this one, and those ran 68.9% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1844thin sample | 327 | 63.0% | 81 min | 1.53% | D |
| All United Airlines on EWR–SFO | 3,793 | 68.9% | 92 min | 2.53% | C |
| All carriers on EWR–SFO | 4,403 | 69.8% | 89 min | 2.32% | C |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1844 quarter by quarter
Quarter by quarter UA 1844 held fairly steady: 60.4% in Jul–Sep 2025, 64.8% in Oct–Dec 2025, 67.8% in Jan–Mar 2026 and 58.2% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202555 flights60.4%
- Oct–Dec 202591 flights64.8%
- Jan–Mar 202690 flights67.8%
- Apr–Jun 202691 flights58.2%
Scale runs 50% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1844 did best on Tuesday at 84.8% on time and worst on Sunday at 44.4%. Each day rests on about 47 flights, so a gap of 40 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1844 runs late
One category carries most of the weight here. National Airspace System accounts for 50% of the 9,645 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.
- 50%National Airspace System
- 27%Carrier
- 22%Late-arriving aircraft
- 1%Extreme weather
50% 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 4,837 minutes out of 9,645, against a national NAS share of 21%. The split is drawn from 9,645 delay minutes reported on UA 1844.
Cancellations sit at 1.53% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
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. 15.2% 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 2,565 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 EWR to CLE (37), MSY to EWR (37) and ATL to EWR (29), 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. 327 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. 15.2% 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 2328 on the same route67.9%
- United Airlines 648 on the same route70.3%
- United Airlines 1343 on the same route69.4%
- United Airlines 2115 on the same route83.9%
- United Airlines 1777 on the same route72.4%
- United Airlines 1960 on the same route73.7%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.