Flight number record
UA 1343
United Airlines · Newark to San Francisco
- Route
- EWR → SFO
- Departs
- 12:00
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1343, check with United Airlines.
UA 1343 draws a D. About one flight in three 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 363 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so UA 1343 runs 13 points behind the country as a whole. Across a thousand flights that is about 132 extra late arrivals.
Key figures
On time
64.1%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
1.65%
National rate is 1.89%
1 hour+ late
21.3%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 21.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1343 flies
UA 1343 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 12:00, used on 154 of 363 flights, with 11:50 (101 flights) and 11:30 (61 flights) next.
- Departs 12:00154 flights42.4%
- Departs 11:50101 flights27.8%
- Departs 11:3061 flights16.8%
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 12:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1343 runs 14 points worse at 64.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1343 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 1343 is 4 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 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1343thin sample | 363 | 64.1% | 90 min | 1.65% | 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 1343 quarter by quarter
UA 1343 did not run the same all year. Its best quarter was Jul–Sep 2025 at 76.7% on time and its weakest Jul–Sep 2026 at 50.8%, a swing of 26 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 flights76.7%
- Oct–Dec 202592 flights62.6%
- Jan–Mar 202690 flights73.6%
- Apr–Jun 202691 flights61.1%
- Jul–Sep 202660 flights50.8%
Scale runs 40% to 80%.
By weekday, UA 1343 did best on Tuesday at 76.5% on time and worst on Monday at 53.8%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1343 runs when it is late
UA 1343 often beats the schedule: 104 of 357 completed flights, 29%, arrived 15 minutes or more early. When UA 1343 is late it tends to be very late: 76 of its 128 late arrivals were an hour or more behind, and 31 were two hours or more.
- 15+ min early104 flights29.1%
- Within 15 min125 flights35.0%
- 15–29 min late22 flights6.2%
- 30–59 min late30 flights8.4%
- 1–2 hours late45 flights12.6%
- 2+ hours late31 flights8.7%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
28 of 140 late departures made up the time and arrived on time, 20% of them. 16 flights left on time and still arrived late.
The worst days
Worst days for UA 1343
The latest arrival of the period was on 21 July 2026, 10 hours 2 minutes behind schedule; most of its delay minutes were filed as extreme weather. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 July 2026 | 10 hours 2 minutes | Extreme weather |
| 15 September 2025 | 7 hours 20 minutes | Carrier |
| 18 July 2026 | 5 hours 48 minutes | Extreme weather |
| 30 October 2025 | 3 hours 59 minutes | Extreme weather |
| 11 October 2025 | 3 hours 54 minutes | Carrier |
Delay causes
Why UA 1343 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.
- 31%Carrier
- 30%National Airspace System
- 29%Late-arriving aircraft
- 11%Extreme weather
No single cause dominates. carrier at 31%, national airspace system at 30% and late-arriving aircraft at 29% split the 12,000 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around. The split is drawn from 11,506 delay minutes reported on UA 1343.
Cancellations sit at 1.65% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
21.3% 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 eight other city pairs in the data, including SRQ to EWR (148), SFO to SAN (81) and MSY to EWR (64), but none flew often enough under UA 1343 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. 363 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 1343
For a booking, UA 1343 is a flight to put a long connection behind. 21.3% 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 2115 on the same route83.2%
- United Airlines 1227 on the same route69.3%
- United Airlines 1960 on the same route70.8%
- 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.