Flight number record

UA 1340

United Airlines · Newark to San Francisco

Route: EWR → SFO
Departs: 17:00
Flights: 279
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1340, check with United Airlines.

UA 1340 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 279 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so UA 1340 runs 15 points behind the country as a whole. Across a thousand flights that is about 153 extra late arrivals.

On time

62.3%

Arrivals under 15 minutes late, of 273 completed flights

Avg delay

102 min

Across delayed arrivals only, not all flights

Cancelled

1.79%

National rate is 1.81%

1 hour+ late

16.5%

National rate is 8.1%

These figures cover 279 flights between July 2025 and June 2026. Beyond the headline rate, 16.5% 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 1340 flies

UA 1340 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 17:00, used on 113 of 279 flights, with 16:30 (54 flights) and 16:40 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:00113 flights40.5%
Departs 16:3054 flights19.4%
Departs 16:4037 flights13.3%

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 17:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1340 runs 6 points worse at 62.3%. 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 1340 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 1340 is 8 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 17 points.

UA 1340 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1340thin sample	279	62.3%	102 min	1.79%	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 1340 quarter by quarter

UA 1340 did not run the same all year. Its best quarter was Jan–Mar 2026 at 78.2% on time and its weakest Oct–Dec 2025 at 51.1%, a swing of 27 points on roughly 93 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 202592 flights51.1%
Jan–Mar 202690 flights78.2%
Apr–Jun 202691 flights57.8%

Scale runs 45% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1340 did best on Tuesday at 79.5% on time and worst on Sunday at 45.9%. Each day rests on about 40 flights, so a gap of 34 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1340 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 11,000 reported delay minutes.

National Airspace System
32%
Carrier
29%
Late-arriving aircraft
28%
Extreme weather
11%

Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.8 times the usual weather exposure. The split is drawn from 10,507 delay minutes reported on UA 1340.

Cancellations sit at 1.79% against a national 1.81%, which is ordinary. Diversions add another 0.36%.

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. 16.5% 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 nine other city pairs in the data, including SFO to BWI (56), IAH to EWR (41) and DEN to SNA (37), but none flew often enough under UA 1340 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. 279 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 1340

For a booking, UA 1340 is a flight to put a long connection behind. 16.5% 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