Carrier route record
UAEWR→STL
United Airlines · Newark to St. Louis
- Flights
- 208
- 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 EWR to STL draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 208 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so United on EWR to STL runs 11 points behind the country as a whole. Across a thousand flights that is about 106 extra late arrivals.
Key figures
On time
66.7%
Arrivals under 15 minutes late, of 198 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
4.81%
National rate is 1.89%
Whole route
82.8%
Every carrier on EWR to STL, 1,074 flights
These figures cover 208 flights between September 2025 and August 2026. Beyond the headline rate, 15.7% 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 EWR to STL
United flew 208 of the 1,074 flights on EWR to STL, about 19% of it. Its 66.7% on time is 16 points worse than the route as a whole, which runs 82.8%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Republic at 86.8% to United at 66.7%.
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 | 866 | 86.8% | 65 min | 5.54% | A− |
| United Airlines (this page)thin sample | 208 | 66.7% | 73 min | 4.81% | C− |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 20 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am63 flights76.2%
- 11am–2pm—
- 2pm–5pm27 flights—
- 5pm–8pm—
- 8pm–5am118 flights56.5%
Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 56.5% on time, against 76.2% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8pm–5am window is the busiest, with 118 flights scheduled in it.
Across the year
United on EWR to STL through the year
- Jul–Sep 20255 flights—
- Oct–Dec 202578 flights76.6%
- Jan–Mar 20264 flights—
- Apr–Jun 202641 flights61.0%
- Jul–Sep 202680 flights57.7%
Scale runs 50% to 80%. 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 66.7% on time across 208 flights.
United on EWR to STL did not run the same all year. Its best quarter was Oct–Dec 2025 at 76.6% on time and its weakest Jul–Sep 2026 at 57.7%, a swing of 19 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, Monday is the strongest day at 74.2% on time and Sunday the weakest at 54.8%, a spread of 19 points.
Arrival by arrival
How late United on EWR to STL runs when it is late
The 66 late arrivals split 10 under half an hour, 25 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early39 flights19.7%
- Within 15 min93 flights47.0%
- 15–29 min late10 flights5.1%
- 30–59 min late25 flights12.6%
- 1–2 hours late23 flights11.6%
- 2+ hours late8 flights4.0%
Scale runs 0% to 100%.
Share of 198 completed flights by arrival against schedule.
7 of 55 late departures made up the time and arrived on time, 13% of them. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at STL.
The worst days
Worst days for United on EWR to STL
The latest arrival of the period was on 8 August 2026, 3 hours 56 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 August 2026 | 3 hours 56 minutes | Late-arriving aircraft |
| 11 June 2026 | 3 hours 39 minutes | Carrier |
| 14 December 2025 | 3 hours 17 minutes | Extreme weather |
| 9 July 2026 | 3 hours 5 minutes | Late-arriving aircraft |
| 7 August 2026 | 2 hours 58 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
Late-arriving aircraft accounts for 46% of the 4,819 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 30%Carrier
- 20%National Airspace System
- 4%Extreme weather
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,819 reported delay minutes here, that single category outweighs weather by 12 to one. The split is drawn from 4,819 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 76.2% on time here.
Cancellations run at 4.81%, against 1.89% nationally. That is about one flight in twenty 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
15.7% 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 73.7% on time across 207 flights, 7 points above 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. 208 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 EWR to STL
Put together: the delay figures matter less here than the 4.81% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 8am–11am 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
- EWR to STL, every carrier
- United on STL to EWR, the return leg
- Republic Airways on EWR to STL86.8%
- United Airlines network-wide record
- Newark Liberty International (EWR) delay statistics
- St. Louis Lambert International (STL) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.