Flight number record

UA 1340

United Airlines · Newark to San Francisco

Route: EWR → SFO
Departs: 17:00
Flights: 338
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 an hour and a half behind schedule. Build slack into anything you connect to. That rests on 338 flights, with a median arrival 4 minutes late.

The national on-time rate over the same period is 77.3%, so UA 1340 runs 17 points behind the country as a whole. Across a thousand flights that is about 169 extra late arrivals.

On time

60.4%

Arrivals under 15 minutes late, of 328 completed flights

Avg delay

100 min

Across delayed arrivals only, not all flights

Cancelled

2.66%

National rate is 1.89%

1 hour+ late

18.0%

National rate is 8.3%

These figures cover 338 flights between September 2025 and August 2026. Beyond the headline rate, 18.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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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 169 of 338 flights, with 16:30 (54 flights) and 16:40 (37 flights) next.

Departs 17:00169 flights50.0%
Departs 16:3054 flights16.0%
Departs 16:4037 flights10.9%

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 17:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1340 runs 8 points worse at 60.4%. 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 1340 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 1340 is 8 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.

UA 1340 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1340thin sample	338	60.4%	100 min	2.66%	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 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 Jul–Sep 2026 at 50.9%, a swing of 27 points on roughly 85 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%
Jul–Sep 202659 flights50.9%

Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1340 did best on Tuesday at 78.3% on time and worst on Monday at 48.9%. Each day rests on about 48 flights, so a gap of 29 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 1340 runs when it is late

UA 1340 often beats the schedule: 86 of 328 completed flights, 26%, arrived 15 minutes or more early. The 130 late arrivals split 31 under half an hour, 40 between 30 and 60 minutes, and 59 an hour or more.

15+ min early86 flights26.2%
Within 15 min112 flights34.1%
15–29 min late31 flights9.5%
30–59 min late40 flights12.2%
1–2 hours late30 flights9.1%
2+ hours late29 flights8.8%

Scale runs 0% to 100%.

Share of 328 completed flights by arrival against schedule.

18 of 109 late departures made up the time and arrived on time, 17% of them. In the other direction, 39 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 1340

The latest arrival of the period was on 20 May 2026, 19 hours 40 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of UA 1340 in the period
Date	Arrived late by	Largest filed cause
20 May 2026	19 hours 40 minutes	Extreme weather
3 January 2026	18 hours 34 minutes	Late-arriving aircraft
15 December 2025	7 hours 18 minutes	Late-arriving aircraft
21 December 2025	5 hours 47 minutes	Late-arriving aircraft
7 August 2026	5 hours 7 minutes	Extreme weather

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 13,000 reported delay minutes.

Carrier
32%
National Airspace System
32%
Late-arriving aircraft
25%
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 1.9 times the usual weather exposure. The split is drawn from 12,939 delay minutes reported on UA 1340.

Cancellations run at 2.66%, against 1.89% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and routes

What a delay on this flight costs

18.0% 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 IAH to EWR (103), SFO to BWI (97) and DEN to SNA (24), 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. 338 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, the cancellation rate is the figure to plan around on UA 1340: 2.66% of its 338 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures