Best Time to Fly STL to EWR: On-Time Stats by Hour & Airline
St Louis Lambert International → Newark Liberty International
Data through July 2026 · Last updated October 18, 2026
1,075 flights were scheduled from St. Louis (STL) to Newark (EWR) in the last 12 months, and 81.2% of those that flew arrived on time, 3.6 points above the US average of 77.6%.
Republic Airways was the most punctual of the 2 airlines on the route at 83.2%, while United Airlines trailed at 69.9%.
September has been the best month (87% on time) and Sunday the weakest day of the week (74%).
4.7% of flights were cancelled, versus 1.8% nationally.
STL to EWR on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airways | 83.2% | 93 min | 5.0% | 917 |
| United Airlines | 69.9% | 90 min | 2.5% | 158 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to EWR
On-time arrival % by scheduled departure hour (local time), 2,048 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 93.6% | 2.4% | 336 |
| 7am–8am | 87.7% | 2.9% | 386 |
| 8am–9am | Limited data | 14 | |
| 10am–11am | Limited data | 7 | |
| 11am–12pm | 81.6% | 4.9% | 446 |
| 12pm–1pm | 82.2% | 4.2% | 213 |
| 1pm–2pm | Limited data | 15 | |
| 4pm–5pm | 58.3% | 5.8% | 103 |
| 5pm–6pm | 68.5% | 5.6% | 498 |
| 6pm–7pm | Limited data | 29 | |
| 7pm–8pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STL to EWR
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 60.5% | -21.1 pts | 0.0% | 38 |
| Christmas & New Year (Dec 20 - Jan 3) | 89.1% | +7.5 pts | 1.8% | 56 |
| Summer peak (Jun 15 - Aug 15) | 74.2% | -7.4 pts | 9.5% | 367 |
| All other days | 81.6% | — | 3.5% | 1,587 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).