Flight number record

UA 648

United Airlines · Newark to San Francisco

Route: EWR → SFO
Departs: 10:00
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 648, check with United Airlines.

UA 648 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 365 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.3%, so UA 648 runs 6 points behind the country as a whole. Across a thousand flights that is about 64 extra late arrivals.

On time

70.9%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

1.64%

National rate is 1.89%

1 hour+ late

10.6%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 10.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When UA 648 flies

UA 648 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 10:00, used on 152 of 365 flights, with 10:40 (103 flights) next.

Departs 10:00152 flights41.6%
Departs 10:40103 flights28.2%

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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 648 runs 13 points worse at 70.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

UA 648 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 648 is 3 points ahead of 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 8 points.

UA 648 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 648	365	70.9%	72 min	1.64%	C
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 648 quarter by quarter

UA 648 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Oct–Dec 2025 at 58.2%, a swing of 29 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 flights86.7%
Oct–Dec 202592 flights58.2%
Jan–Mar 202690 flights82.6%
Apr–Jun 202691 flights67.8%
Jul–Sep 202662 flights70.5%

Scale runs 50% to 90%.

By weekday, UA 648 ranged from 64.7% on Friday to 76.5% on Tuesday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late UA 648 runs when it is late

UA 648 often beats the schedule: 103 of 358 completed flights, 29%, arrived 15 minutes or more early. The 104 late arrivals split 31 under half an hour, 35 between 30 and 60 minutes, and 38 an hour or more.

15+ min early103 flights28.8%
Within 15 min151 flights42.2%
15–29 min late31 flights8.7%
30–59 min late35 flights9.8%
1–2 hours late18 flights5.0%
2+ hours late20 flights5.6%

Scale runs 0% to 100%.

Share of 358 completed flights by arrival against schedule.

A late pushback is often recovered here: of 107 departures that left 15 minutes late or more, 34 still arrived on time. In the other direction, 31 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 648

The latest arrival of the period was on 12 November 2025, 4 hours 44 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of UA 648 in the period
Date	Arrived late by	Largest filed cause
12 November 2025	4 hours 44 minutes	Carrier
24 June 2026	4 hours 44 minutes	Late-arriving aircraft
22 July 2026	4 hours 11 minutes	Late-arriving aircraft
13 May 2026	4 hours 9 minutes	Carrier
2 September 2025	4 hours 5 minutes	Late-arriving aircraft

Delay causes

Why UA 648 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 7,483 reported delay minutes.

National Airspace System
38%
Carrier
34%
Late-arriving aircraft
27%
Extreme weather
1%

38% 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 2,810 minutes out of 7,483, against a national NAS share of 21%. The split is drawn from 7,483 delay minutes reported on UA 648.

Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.27%.

Connections and routes

What a delay on this flight costs

10.6% 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 four other city pairs in the data, including STL to EWR (47), SFO to MSP (24) and SFO to ORD (14), but none flew often enough under UA 648 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 648

For a booking, read UA 648 as 70.9% on time with 1.64% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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