Carrier route record
DLSLC→EWR
Delta Air Lines · Salt Lake City to Newark
- Flights
- 723
- Period
- September 2025 to August 2026
- Share of route
- 54%
- Carriers
- 2
Historical statistics for September 2025 to August 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 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 723 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 77.3%. That gap is worth roughly 43 fewer late arrivals for every thousand flights.
Key figures
On time
81.6%
Arrivals under 15 minutes late, of 700 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
2.63%
National rate is 1.89%
Whole route
80.1%
Every carrier on SLC to EWR, 1,338 flights
These figures cover 723 flights between September 2025 and August 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.
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Carrier by carrier
Delta against every carrier on SLC to EWR
Delta flew 723 of the 1,338 flights on SLC to EWR, most of the route. Its 81.6% on time is 2 points better than the route as a whole, which runs 80.1%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Delta at 81.6% to United at 78.4%.
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) | 723 | 81.6% | 60 min | 2.63% | B |
| United Airlines | 615 | 78.4% | 89 min | 2.28% | B |
Flight by flight
Delta flight numbers on SLC to EWR
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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 15 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am160 flights83.7%
- 11am–2pm205 flights72.7%
- 2pm–5pm—
- 5pm–8pm126 flights82.5%
- 8pm–5am232 flights87.3%
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 72.7% on time against 87.3% 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 8pm–5am window is the busiest, with 232 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 90.1% on time and Saturday the weakest at 71.1%, a spread of 19 points.
Arrival by arrival
How late Delta on SLC to EWR runs when it is late
Delta on SLC to EWR often beats the schedule: 208 of 700 completed flights, 30%, arrived 15 minutes or more early. The 129 late arrivals split 62 under half an hour, 31 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early208 flights29.7%
- Within 15 min363 flights51.9%
- 15–29 min late62 flights8.9%
- 30–59 min late31 flights4.4%
- 1–2 hours late19 flights2.7%
- 2+ hours late17 flights2.4%
Scale runs 0% to 100%.
Share of 700 completed flights by arrival against schedule.
31 of 126 late departures made up the time and arrived on time, 25% of them. 34 flights left on time and still arrived late.
The worst days
Worst days for Delta on SLC to EWR
The latest arrival of the period was on 9 November 2025, 6 hours 24 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across November, October, December and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 November 2025 | 6 hours 24 minutes | National Airspace System |
| 30 October 2025 | 5 hours 52 minutes | National Airspace System |
| 30 December 2025 | 4 hours 45 minutes | Carrier |
| 13 November 2025 | 4 hours 38 minutes | Late-arriving aircraft |
| 18 February 2026 | 3 hours 44 minutes | Extreme weather |
Delay causes
Why Delta runs late on this route
National Airspace System accounts for 49% of the 7,716 delay minutes carriers reported here, and the remaining four split what is left.
- 49%National Airspace System
- 23%Carrier
- 22%Late-arriving aircraft
- 6%Extreme weather
49% 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 3,788 minutes out of 7,716, against a national NAS share of 21%. The split is drawn from 7,716 reported delay minutes.
Cancellations run at 2.63%, 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 stage length
What a delay here costs
5.1% of arrivals land an hour or more late, close to the national 8.3%, so 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 76.7% on time across 723 flights, 5 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 5 points of difference.
One caution: this is a thin sample. 723 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. 723 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 81.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 700 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 EWR78.4%
- Delta Air Lines network-wide record
- Salt Lake City International (SLC) delay statistics
- Newark Liberty International (EWR) delay statistics
- The US routes with the most cancellations
- The best time of day to fly, according to 7.05 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.