Carrier route record

UASLC→EWR

United Airlines · Salt Lake City to Newark

Flights: 615
Period: July 2025 to June 2026
Share of route: 46%
Carriers: 2

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

United on SLC to EWR lands a B, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 615 flights, with a median arrival 10 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate United on SLC to EWR from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

77.9%

Arrivals under 15 minutes late, of 596 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

2.44%

National rate is 1.81%

Whole route

79.9%

Every carrier on SLC to EWR, 1,337 flights

These figures cover 615 flights between July 2025 and June 2026. Beyond the headline rate, 9.4% 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.

Carrier by carrier

United against every carrier on SLC to EWR

United flew 615 of the 1,337 flights on SLC to EWR, about 46% of it. Its 77.9% on time is 2 points worse than the route as a whole, which runs 79.9%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 81.7% to United at 77.9%.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on SLC to EWR
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	722	81.7%	65 min	2.49%	B
United Airlines (this page)	615	77.9%	80 min	2.44%	B

Departure window

When United runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am81 flights89.7%
8am–11am—
11am–2pm216 flights73.2%
2pm–5pm92 flights73.6%
5pm–8pm—
8pm–5am226 flights79.8%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 73.2% on time against 89.7% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 226 flights scheduled in it.

Across the year

United on SLC to EWR through the year

Darker means more delays. Figures are on-time percentages.May best, August worst

August is the worst month at 61.3% on time, 31 points below May, the best at 92.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 105 flights.

Across the week, Tuesday is the strongest day at 85.1% on time and Saturday the weakest at 70.9%. 14 points is a smaller lever than departure hour, but it is free.

Delay causes

Why United runs late on this route

One category carries most of the weight here. National Airspace System accounts for 45% of the 11,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
45%
Late-arriving aircraft
26%
Carrier
25%
Extreme weather
3%

45% 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 4,765 minutes out of 11,000, against a national NAS share of 21%. The split is drawn from 10,518 reported delay minutes.

Cancellations sit at 2.44% against a national 1.81%, which is ordinary. Diversions add another 0.65%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.4% 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 1,969 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 return leg runs 77.7% on time across 615 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 615 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 United on SLC to EWR

Put together: treat all of this as provisional. 615 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 77.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 596 completed flights over 12 months sit behind that.

Where to go next

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