Flight number record

UA 1343

United Airlines · Newark to San Francisco

Route: EWR → SFO
Departs: 12:00
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1343, check with United Airlines.

UA 1343 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 365 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.6%, so UA 1343 runs 8 points behind the country as a whole. Across a thousand flights that is about 82 extra late arrivals.

On time

69.4%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

85 min

Across delayed arrivals only, not all flights

Cancelled

1.64%

National rate is 1.81%

1 hour+ late

17.3%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 17.3% 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 1343 flies

UA 1343 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 12:00, used on 157 of 365 flights, with 11:25 (70 flights) and 11:30 (61 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:00157 flights43.0%
Departs 11:2570 flights19.2%
Departs 11:3061 flights16.7%

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 12:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1343 runs 9 points worse at 69.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1343 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 1343 is about level with 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 10 points.

UA 1343 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1343	365	69.4%	85 min	1.64%	C
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 1343 quarter by quarter

UA 1343 did not run the same all year. Its best quarter was Jul–Sep 2025 at 80.2% on time and its weakest Apr–Jun 2026 at 61.1%, a swing of 19 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 flights80.2%
Oct–Dec 202592 flights62.6%
Jan–Mar 202690 flights73.6%
Apr–Jun 202691 flights61.1%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1343 did best on Wednesday at 78.4% on time and worst on Monday at 58.8%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

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 9,360 reported delay minutes.

Late-arriving aircraft
36%
Carrier
34%
National Airspace System
27%
Extreme weather
4%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 9,360 reported delay minutes here, that single category outweighs weather by 8 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 9,360 delay minutes reported on UA 1343.

Cancellations sit at 1.64% 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. 17.3% 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 eight other city pairs in the data, including SRQ to EWR (94), MSY to EWR (64) and SFO to SAN (41), 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. 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.

What to do with this

Booking UA 1343

For a booking, UA 1343 is a flight to put a long connection behind. 17.3% 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.

Where to go next

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.

Key figures