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Flight Reliability

UA 3630 · United Airlines

Newark → St. Louis (EWR–STL)87% of its flights flew this route. The rest (BNA–ORD, MCI–ORD) are included in these numbers.

84
Pretty Reliable
WanderNerd Reliability Score
91%
Arrive within 15 minutes
8 min early
Average arrival delay
3.1%
Cancelled
15 min early
Median arrival delay

Based on 353 historical flights. Data through May 2026.

What the data says

Skip Saturday if you can.

UA 3630 arrived on time 94% of the time on Sundays. On Saturdays: 85%.

A bit ahead of the EWR–STL route.

UA 3630 arrived on time 91% of the time, versus 85% across the EWR–STL route.

Better than the United Airlines network average.

UA 3630 arrived on time 91% of the time, versus 79% across the United Airlines network.

Keep a backup plan handy.

UA 3630 was cancelled 3.1% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon91%(46 flights)
  • Tue94%(47 flights)
  • Wed94%(49 flights)
  • Thu86%(49 flights)
  • Fri90%(50 flights)
  • Sat85%(48 flights)
  • Sun94%(51 flights)
On-time by departure window
  • 6–9 AM91%(110 flights)
  • 9 AM–12 PM90%(222 flights)
  • 12–3 PM—(3 flights)
  • 6–9 PM—(5 flights)
On-time trend by month
97%
May

Jun 86% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%29
July 202590%31
August 202594%31
September 2025100%27
October 202583%30
November 202581%26
December 202592%24
January 202682%28
February 202688%25
March 202693%29
April 2026100%30
May 202697%30
Departures on time
92%
Diverted
0.6%
Flights flown
340
Months covered
12

Same route, other flights

Keep nerding

Based on 353 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.