Flight number record
YX 3630
Republic Airways · Newark to St. Louis
- Route
- EWR → STL
- Departs
- 09:00
- Flights
- 308
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s YX 3630, check with Republic Airways. Republic Airways flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
YX 3630 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 308 flights, with a median arrival 15 minutes early.
Set against the rest of the country, YX 3630's record is 14 points better than the US average of 77.6%. That gap is worth roughly 140 fewer late arrivals for every thousand flights.
Key figures
On time
91.6%
Arrivals under 15 minutes late, of 297 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
2.92%
National rate is 1.81%
1 hour+ late
2.7%
National rate is 8.1%
These figures cover 308 flights between July 2025 and June 2026. The median arrival is 15 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.
Schedule
When YX 3630 flies
YX 3630 flies EWR to STL without a single fixed slot. Its most common scheduled departure was 09:00, used on 133 of 308 flights, with 08:35 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 09:00133 flights43.2%
- Departs 08:3536 flights11.7%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 09:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and YX 3630 runs 8 points better at 91.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
YX 3630 next to EWR to STL
Every carrier on EWR to STL combined arrived on time 84.6% of the time across 1,074 flights, so YX 3630 is 7 points ahead of it. Republic flew 946 flights on the same city pair under all its flight numbers, including this one, and those ran 86.4% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 3630thin sample | 308 | 91.6% | 59 min | 2.92% | A |
| All Republic Airways on EWR–STL | 946 | 86.4% | 69 min | 5.60% | A− |
| All carriers on EWR–STL | 1,074 | 84.6% | 69 min | 5.03% | B− |
| Republic Airways, whole network | 361,482 | 78.5% | 72 min | 4.08% | B− |
Across the year
YX 3630 quarter by quarter
Quarter by quarter YX 3630 held fairly steady: 94.4% in Jul–Sep 2025, 89.2% in Oct–Dec 2025, 87.8% in Jan–Mar 2026 and 93.3% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202589 flights94.4%
- Oct–Dec 202539 flights89.2%
- Jan–Mar 202689 flights87.8%
- Apr–Jun 202691 flights93.3%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, YX 3630 did best on Sunday at 100.0% on time and worst on Monday at 85.0%. Each day rests on about 44 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why YX 3630 runs late
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 1,472 reported delay minutes.
- 42%Carrier
- 32%Late-arriving aircraft
- 27%National Airspace System
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 617 of the 1,472 delay minutes reported here. The split is drawn from 1,472 delay minutes reported on YX 3630.
Cancellations run at 2.92%, against 1.81% nationally. That is roughly 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 routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.7% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on four other city pairs in the data, including BNA to ORD (25), MCI to ORD (11) and PIT to IAD (5), but none flew often enough under YX 3630 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to STL only.
One caution: this is a thin sample. 308 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 YX 3630
For a booking, the cancellation rate is the figure to plan around on YX 3630: 2.92% of its 308 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- EWR to STL, every carrier and departure
- STL to EWR, the return direction
- Republic Airways 3719 on the same route88.4%
- Newark Liberty International (EWR) delay statistics
- St. Louis Lambert International (STL) delay statistics
- Republic Airways on-time record
- Every Republic Airways flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means Republic Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.