Route reliability record
SLC→EWR
Salt Lake City to Newark
- Flights
- 1,337
- Period
- July 2025 to June 2026
- Distance
- 1,969 mi
- Carriers
- 2
This route lands a B, 2 points better than the national rate of 77.6%. About 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 1,337 SLC to EWR flights, of which Delta Air Lines flew 722 at 81.7% on time.
Best time to fly SLC to EWR: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 89.7% of the time and Tuesday flights 88.4%, against 79.9% for the route overall.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.9%
Arrivals under 15 minutes late, of 1,294 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
2.47%
National rate is 1.81%
Best carrier
Delta
81.7% on time across 722 flights
These figures cover 1,337 flights between July 2025 and June 2026. The median arrival is 7 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
Which airline is most reliable on SLC to EWR
The two carriers here are closely matched: 4 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 722 | 81.7% | 65 min | 2.49% | B |
| United Airlines | 615 | 77.9% | 80 min | 2.44% | B |
No carrier stands out. Delta tops the table at 81.7%, 4 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on SLC to EWR
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly Salt Lake City to Newark
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. SLC → JFKSalt Lake City to New York | Delta Air Lines | 82.1% | 83.5% | 1.63% | 5am–8am, Sat | DL 705 23:55 |
| 2. SLC → EWRSalt Lake City to Newark | Delta Air Lines | 79.7% | 81.7% | 2.49% | 8pm–5am, Tue | DL 2038 23:59 |
| 3. SLC → EWRSalt Lake City to Newark | United Airlines | 76.0% | 77.9% | 2.44% | 5am–8am, Tue | — |
| 4. SLC → JFKSalt Lake City to New York | JetBlue Airways | 73.6% | 75.9% | 3.05% | 8pm–5am, Mon | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 4 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am81 flights89.7%
- 8am–11am116 flights82.5%
- 11am–2pm465 flights72.2%
- 2pm–5pm92 flights73.6%
- 5pm–8pm124 flights86.4%
- 8pm–5am459 flights84.8%
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 72.2% 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 11am–2pm window is the busiest, with 465 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 24 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
May is the best month on the calendar at 90.0% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 167 flights.
Across the week, Tuesday is the strongest day at 88.4% on time and Saturday the weakest at 73.6%. 15 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. National Airspace System accounts for 51% of the 19,000 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.
- 51%National Airspace System
- 23%Carrier
- 23%Late-arriving aircraft
- 3%Extreme weather
51% 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 9,609 minutes out of 19,000, against a national NAS share of 21%. The split is drawn from 18,855 reported delay minutes.
Cancellations sit at 2.47% against a national 1.81%, which is ordinary. Diversions add another 0.75%.
Connections and stage length
What a delay here actually costs
7.4% 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 a little over 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 76.6% on time across 1,337 flights, 3 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 3 points of difference.
The sample behind these figures is 1,337 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in EWR after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 90.0% on time and October 66.3%, a swing of 24 points. If the dates move at all, move them out of October before you think about anything else. 1,294 completed flights over 12 months sit behind that.
Common questions
SLC to EWR questions
How often is SLC to EWR delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.1% of the 1,337 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on SLC to EWR?
Delta Air Lines leads at 81.7% on time across 722 flights. United Airlines is at the other end on 77.9%, a gap of 4 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on SLC to EWR?
The 5am–8am departure window is the strongest at 89.7% on time. The 11am–2pm window is the weakest at 72.2%, 18 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are October delays on SLC to EWR?
October is the weakest month at 66.3% on time, compared with 90.0% in May. Across the year that is 24 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- EWR to SLC — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- Newark Liberty International (EWR) delay statistics
- Delta Air Lines on SLC to EWR81.7%
- United Airlines on SLC to EWR77.9%
- SLC to DEN, a related route77.8%
- MCO to EWR, a related route73.8%
- SLC to PHX, a related route83.9%
- Delta Air Lines on-time record81.7%
- United Airlines on-time record77.9%
- 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
Direction matters. SLC to EWR and EWR to SLC are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.