Flight number record
YX 3630
Republic Airways · Newark to St. Louis
- Route
- EWR → STL
- Departs
- 09:00
- Flights
- 287
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs about an hour. That rests on 287 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 77.3%. That gap is worth roughly 135 fewer late arrivals for every thousand flights.
Key figures
On time
90.8%
Arrivals under 15 minutes late, of 273 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
4.18%
National rate is 1.89%
1 hour+ late
3.3%
National rate is 8.3%
These figures cover 287 flights between September 2025 and August 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.
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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 105 of 287 flights, with 09:53 (51 flights) and 08:35 (36 flights) next.
- Departs 09:00105 flights36.6%
- Departs 09:5351 flights17.8%
- Departs 08:3536 flights12.5%
Scale runs 0% to 100%.
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 83.9%, and YX 3630 runs 7 points better at 90.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
YX 3630 next to EWR to STL
Every carrier on EWR to STL combined arrived on time 82.8% of the time across 1,074 flights, so YX 3630 is 8 points ahead of it. Republic flew 866 flights on the same city pair under all its flight numbers, including this one, and those ran 86.8% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 3630thin sample | 287 | 90.8% | 59 min | 4.18% | A− |
| All Republic Airways on EWR–STL | 866 | 86.8% | 65 min | 5.54% | A− |
| All carriers on EWR–STL | 1,074 | 82.8% | 68 min | 5.40% | B− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 3630 quarter by quarter
Quarter by quarter YX 3630 held fairly steady: 89.2% in Oct–Dec 2025, 87.8% in Jan–Mar 2026, 93.3% in Apr–Jun 2026 and 86.8% in Jul–Sep 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 202527 flights—
- Oct–Dec 202539 flights89.2%
- Jan–Mar 202689 flights87.8%
- Apr–Jun 202691 flights93.3%
- Jul–Sep 202641 flights86.8%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, YX 3630 did best on Sunday at 97.5% on time and worst on Monday at 81.1%. Each day rests on about 41 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 3630 runs when it is late
YX 3630 often beats the schedule: 145 of 273 completed flights, 53%, arrived 15 minutes or more early. The 25 late arrivals split 9 under half an hour, 7 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early145 flights53.1%
- Within 15 min103 flights37.7%
- 15–29 min late9 flights3.3%
- 30–59 min late7 flights2.6%
- 1–2 hours late6 flights2.2%
- 2+ hours late3 flights1.1%
Scale runs 0% to 100%.
Share of 273 completed flights by arrival against schedule.
5 of 20 late departures made up the time and arrived on time, 25% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for YX 3630
The latest arrival of the period was on 20 October 2025, 3 hours 1 minute behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across October, January and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 October 2025 | 3 hours 1 minute | Late-arriving aircraft |
| 27 January 2026 | 2 hours 52 minutes | Carrier |
| 23 March 2026 | 2 hours 47 minutes | Late-arriving aircraft |
| 1 January 2026 | 1 hour 35 minutes | Carrier |
| 25 October 2025 | 1 hour 28 minutes | National Airspace System |
Delay causes
Why YX 3630 runs late
Carrier accounts for 44% of the 1,472 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 30%Late-arriving aircraft
- 26%National Airspace System
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 646 of the 1,472 delay minutes reported here. The split is drawn from 1,472 delay minutes reported on YX 3630.
Cancellations run at 4.18%, against 1.89% nationally. That is about one flight in 25 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 3.3% land an hour or more behind schedule, against 8.3% 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.
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. 287 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: 4.18% of its 287 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
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.