Carrier route record
DLSLC→EWR
Delta Air Lines · Salt Lake City to Newark
- 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 SLC to EWR lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 722 flights, with a median arrival 6 minutes early.
Set against the rest of the country, Delta's SLC to EWR record is 4 points better than the US average of 77.6%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.
Key figures
On time
81.7%
Arrivals under 15 minutes late, of 698 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
2.49%
National rate is 1.81%
Whole route
79.9%
Every carrier on SLC to EWR, 1,337 flights
These figures cover 722 flights between July 2025 and June 2026. The median arrival is 6 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Carrier by carrier
Delta against every carrier on SLC to EWR
Delta flew 722 of the 1,337 flights on SLC to EWR, most of the route. Its 81.7% on time is 2 points better than the route as a whole, which runs 79.9%. Ranked by on-time rate it is first 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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page) | 722 | 81.7% | 65 min | 2.49% | B |
| United Airlines | 615 | 77.9% | 80 min | 2.44% | B |
Flight by flight
Delta flight numbers on SLC to EWR
Departure window
When Delta runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 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–8am—
- 8am–11am116 flights82.5%
- 11am–2pm249 flights71.3%
- 2pm–5pm—
- 5pm–8pm124 flights86.4%
- 8pm–5am233 flights89.5%
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 71.3% on time against 89.5% for 8pm–5am. 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 11am–2pm window is the busiest, with 249 flights scheduled in it.
Across the year
Delta on SLC to EWR through the year
May is the best month on the calendar at 88.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. January was the busiest month here, with 62 flights.
Across the week, Tuesday is the strongest day at 91.3% on time and Thursday the weakest at 70.0%. 21 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. National Airspace System accounts for 58% of the 8,337 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.
- 58%National Airspace System
- 20%Carrier
- 18%Late-arriving aircraft
- 3%Extreme weather
58% 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 4,843 minutes out of 8,337, against a national NAS share of 21%. The split is drawn from 8,337 reported delay minutes.
Cancellations sit at 2.49% against a national 1.81%, which is ordinary. Diversions add another 0.83%.
Connections and stage length
What a delay here costs
5.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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 75.6% on time across 722 flights, 6 points below 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 SLC to EWR
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 81.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 698 completed flights over 12 months sit behind that.
Related
Where to go next
- SLC to EWR, every carrier
- Delta on EWR to SLC, the return leg
- United Airlines on SLC to EWR77.9%
- Delta Air Lines network-wide record
- Salt Lake City International (SLC) delay statistics
- Newark Liberty International (EWR) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.