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Flight Reliability

UA 559 · United Airlines

Newark → Miami (EWR–MIA)86% of its flights flew this route. The rest (EWR–MCO, SFO–MFR) are included in these numbers.

95
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
11 min early
Average arrival delay
1.5%
Cancelled
16 min early
Median arrival delay

Based on 204 historical flights. Data through May 2026.

What the data says

The 9 AM–12 PM departure wins.

UA 559 departing between 9 AM–12 PM arrived on time 100% of the time, versus 92% between 6–9 AM.

Sunday scaries are real for this one.

UA 559 arrived on time 100% of the time on Thursdays and just 76% on Sundays. That gap is worth planning around.

Well ahead of the EWR–MIA route.

UA 559 arrived on time 93% of the time, versus 77% across the EWR–MIA route.

Better than the United Airlines network average.

UA 559 arrived on time 93% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon90%(29 flights)
  • Tue96%(27 flights)
  • Wed97%(29 flights)
  • Thu100%(29 flights)
  • Fri93%(28 flights)
  • Sat100%(30 flights)
  • Sun76%(29 flights)
On-time by departure window
  • 6–9 AM92%(173 flights)
  • 9 AM–12 PM100%(22 flights)
  • 6–9 PM—(4 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
95%
May

Sep 96% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 202596%28
October 202590%30
November 202590%31
December 202594%17
February 202693%15
March 202687%31
April 2026100%30
May 202695%19
Departures on time
96%
Diverted
0%
Flights flown
201
Months covered
8

Same route, other flights

Keep nerding

Based on 204 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.