Route reliability record
EWR→DEN
Newark to Denver
- Flights
- 3,349
- Period
- September 2025 to August 2026
- Distance
- 1,605 mi
- Carriers
- 1
This route lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 3,349 EWR to DEN flights, with a median arrival 7 minutes early.
Best time to fly EWR to DEN: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 89.4% of the time and Tuesday flights 80.4%, against 77.6% for the route overall.
The US average over the same twelve months is 77.3%, 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
77.6%
Arrivals under 15 minutes late, of 3,281 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
1.46%
National rate is 1.89%
Best carrier
United
77.6% on time across 3,349 flights
These figures cover 3,349 flights between September 2025 and August 2026. Beyond the headline rate, 9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on EWR to DEN
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 | 3,349 | 77.6% | 84 min | 1.46% | B |
Flight by flight
Flights on EWR to DEN
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.
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Best ways to make this trip
The most reliable ways to fly Newark to Denver
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. 4 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. EWR → DENNewark to Denver | United Airlines | 76.5% | 77.6% | 1.46% | 5am–8am, Tue | UA 2455 10:00 |
| 2. LGA → DENNew York to Denver | United Airlines | 76.0% | 77.6% | 2.08% | 8am–11am, Sat | UA 2200 12:15 |
| 3. JFK → DENNew York to Denver | Delta Air Lines | 71.8% | 73.7% | 2.56% | 8am–11am, Tue | DL 532 08:30 |
| 4. LGA → DENNew York to Denver | Delta Air Lines | 67.5% | 70.7% | 4.55% | 5am–8am, Sat | DL 751 07:30 |
| 5. JFK → DENNew York to Denver | JetBlue Airways | 64.4% | 67.9% | 5.14% | 8am–11am, Wed | B6 97 20:15 |
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 21 points, against half a point between the best and worst carrier.
- 5am–8am438 flights89.4%
- 8am–11am645 flights82.3%
- 11am–2pm468 flights83.7%
- 2pm–5pm823 flights73.4%
- 5pm–8pm617 flights68.8%
- 8pm–5am358 flights71.1%
Scale runs 60% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.4% of the time, against 68.8% for the evening window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 823 flights scheduled in it.
Explore
Filter EWR to DEN by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On EWR to DEN, the best departure window is 5am–8am at 89.4% on time and the worst is 5pm–8pm at 68.8%, a wide gap of 20.6 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.4%
- 8–11am82.3%
- 11am–2pm83.7%
- 2–5pm73.4%
- 5–8pm68.8%
- 8pm–5am71.1%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 25 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.
August is the worst month at 63.8% on time, 25 points below April, the best at 88.9%. 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. July was the busiest month here, with 306 flights.
Across the week, Tuesday is the strongest day at 80.4% on time and Saturday the weakest at 74.7%, a spread of 6 points.
Delay causes
Why this route gets delayed
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 61,000 reported delay minutes.
- 33%Late-arriving aircraft
- 31%Carrier
- 30%National Airspace System
- 6%Extreme weather
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 89.4% on time here. The split is drawn from 61,324 reported delay minutes.
No single cause dominates. late-arriving aircraft at 33%, carrier at 31% and national airspace system at 30% split the 61,000 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around.
Cancellations sit at 1.46% against a national 1.89%, which is ordinary. Diversions add another 0.57%.
Connections and stage length
What a delay here actually costs
9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 1,605 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 78.8% on time across 3,344 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 3,349 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 DEN 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. April runs 88.9% on time and August 63.8%, a swing of 25 points. If the dates move at all, move them out of August before you think about anything else. 3,281 completed flights over 12 months sit behind that.
Common questions
EWR to DEN questions
How often is EWR to DEN delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.4% of the 3,349 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is EWR to DEN compared with the rest of the country?
77.6% of flights arrive on time here against a national 77.3%, a difference of half a point in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on EWR to DEN?
The 5am–8am departure window is the strongest at 89.4% on time. The 5pm–8pm window is the weakest at 68.8%, 21 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 August delays on EWR to DEN?
August is the weakest month at 63.8% on time, compared with 88.9% in April. Across the year that is 25 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
- DEN to EWR — the return legseparate record
- Newark Liberty International (EWR) delay statistics
- Denver International (DEN) delay statistics
- EWR to MCO, a related route77.9%
- PHX to DEN, a related route76.7%
- EWR to ATL, a related route76.9%
- United Airlines on-time record77.6%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. EWR to DEN and DEN to EWR 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.