Carrier route record
DLEWR→SLC
Delta Air Lines · Newark to Salt Lake City
- Flights
- 722
- Period
- July 2025 to June 2026
- Share of route
- 54%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on EWR to SLC sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 722 flights, with a median arrival 1 minute early.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on EWR to SLC from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.6%
Arrivals under 15 minutes late, of 705 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
2.22%
National rate is 1.81%
Whole route
76.6%
Every carrier on EWR to SLC, 1,337 flights
These figures cover 722 flights between July 2025 and June 2026. Beyond the headline rate, 9.9% 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
Delta against every carrier on EWR to SLC
Delta flew 722 of the 1,337 flights on EWR to SLC, most of the route. Its 75.6% on time is about level with the route as a whole at 76.6%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 77.7% to Delta at 75.6%.
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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 615 | 77.7% | 60 min | 2.11% | B |
| Delta Air Lines (this page) | 722 | 75.6% | 88 min | 2.22% | B |
Flight by flight
Delta flight numbers on EWR to SLC
Departure window
When Delta runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 722 flights.
- 5am–8am364 flights78.7%
- 8am–11am—
- 11am–2pm—
- 2pm–5pm9 flights—
- 5pm–8pm349 flights72.3%
- 8pm–5am—
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 78.7% on time for the 5am–8am window against 72.3% for 5pm–8pm. Worth taking if the schedule allows, not worth an extra connection. The 5am–8am window is the busiest, with 364 flights scheduled in it.
Across the year
Delta on EWR to SLC through the year
July is the worst month at 56.1% on time, 34 points below September, the best at 90.0%. 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. January was the busiest month here, with 62 flights.
Across the week, Monday is the strongest day at 80.8% on time and Saturday the weakest at 67.3%. 14 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
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 15,000 reported delay minutes.
- 34%Carrier
- 30%Late-arriving aircraft
- 26%National Airspace System
- 10%Extreme weather
The largest share of delay minutes, 34%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 5,159 of the 15,000 delay minutes reported here. The split is drawn from 15,085 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 78.7% on time here.
Cancellations sit at 2.22% against a national 1.81%, which is ordinary. Diversions add another 0.14%.
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. 9.9% 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 is a different operation and performs like one: it runs 81.7% on time across 722 flights, 6 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
One caution: this is a thin sample. 722 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 Delta on EWR to SLC
Put together: treat all of this as provisional. 722 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 75.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 705 completed flights over 12 months sit behind that.
Related
Where to go next
- EWR to SLC, every carrier
- Delta on SLC to EWR, the return leg
- United Airlines on EWR to SLC77.7%
- Delta Air Lines network-wide record
- Newark Liberty International (EWR) delay statistics
- Salt Lake City International (SLC) delay statistics
- How often a connection fails at the major US hubs
- Connecting flights: how much buffer the data says you need
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.