Carrier route record
UASTL→EWR
United Airlines · St. Louis to Newark
- Flights
- 207
- Period
- September 2025 to August 2026
- Share of route
- 19%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on STL to EWR sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 207 flights, with a median arrival 9 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate United on STL to EWR from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
73.7%
Arrivals under 15 minutes late, of 198 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
3.38%
National rate is 1.89%
Whole route
81.4%
Every carrier on STL to EWR, 1,075 flights
These figures cover 207 flights between September 2025 and August 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
United against every carrier on STL to EWR
United flew 207 of the 1,075 flights on STL to EWR, about 19% of it. Its 73.7% on time is 8 points worse than the route as a whole, which runs 81.4%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Republic at 83.3% to United at 73.7%.
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 |
|---|---|---|---|---|---|
| Republic Airways | 868 | 83.3% | 93 min | 5.99% | B− |
| United Airlines (this page)thin sample | 207 | 73.7% | 90 min | 3.38% | C− |
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Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 36 points, against half a point between the best and worst carrier.
- 5am–8am118 flights92.7%
- 8am–11am—
- 11am–2pm63 flights56.5%
- 2pm–5pm—
- 5pm–8pm26 flights—
- 8pm–5am—
Scale runs 50% to 100%. 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 56.5% on time against 92.7% 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 5am–8am window is the busiest, with 118 flights scheduled in it.
Across the year
United on STL to EWR through the year
- Jul–Sep 20255 flights—
- Oct–Dec 202578 flights50.0%
- Jan–Mar 20264 flights—
- Apr–Jun 202640 flights92.5%
- Jul–Sep 202680 flights88.7%
Scale runs 40% to 100%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 73.7% on time across 207 flights.
United on STL to EWR did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.5% on time and its weakest Oct–Dec 2025 at 50.0%, a swing of 43 points on roughly 69 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Wednesday is the strongest day at 80.0% on time and Tuesday the weakest at 70.0%, a spread of 10 points.
Arrival by arrival
How late United on STL to EWR runs when it is late
United on STL to EWR often beats the schedule: 73 of 198 completed flights, 37%, arrived 15 minutes or more early. The 52 late arrivals split 15 under half an hour, 15 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early73 flights36.9%
- Within 15 min73 flights36.9%
- 15–29 min late15 flights7.6%
- 30–59 min late15 flights7.6%
- 1–2 hours late10 flights5.1%
- 2+ hours late12 flights6.1%
Scale runs 0% to 100%.
Share of 198 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 51 departures that left 15 minutes late or more, only 5 made it up before arrival. 6 flights left on time and still arrived late.
The worst days
Worst days for United on STL to EWR
The latest arrival of the period was on 14 December 2025, 10 hours 56 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 December 2025 | 10 hours 56 minutes | Late-arriving aircraft |
| 9 November 2025 | 8 hours 22 minutes | National Airspace System |
| 20 August 2026 | 3 hours 55 minutes | National Airspace System |
| 26 September 2025 | 3 hours 13 minutes | Carrier |
| 25 September 2025 | 3 hours 11 minutes | National Airspace System |
Delay causes
Why United runs late on this route
National Airspace System accounts for 56% of the 4,666 delay minutes carriers reported here, and the remaining four split what is left.
- 56%National Airspace System
- 27%Late-arriving aircraft
- 14%Carrier
- 3%Extreme weather
56% 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 2,603 minutes out of 4,666, against a national NAS share of 21%. The split is drawn from 4,666 reported delay minutes.
Cancellations run at 3.38%, against 1.89% nationally. That is about one flight in 30 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
11.1% 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.
The 872 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 66.7% on time across 208 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 207 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 United on STL to EWR
Put together: the delay figures matter less here than the 3.38% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 198 completed flights over 12 months sit behind that.
Related
Where to go next
- STL to EWR, every carrier
- United on EWR to STL, the return leg
- Republic Airways on STL to EWR83.3%
- United Airlines network-wide record
- St. Louis Lambert International (STL) 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.