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Flight Reliability

UA 251 · United Airlines

Washington → New Orleans (IAD–MSY)91% of its flights flew this route. The rest (ABQ–IAH, IAH–TPA) are included in these numbers.

88
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
8 min
Average arrival delay
0.3%
Cancelled
7 min early
Median arrival delay

Based on 381 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

UA 251 departing between 6–9 AM arrived on time 94% of the time, versus 82% between 3–6 PM.

Sunday scaries are real for this one.

UA 251 arrived on time 93% of the time on Mondays and just 71% on Sundays. That gap is worth planning around.

A bit behind the IAD–MSY route.

UA 251 arrived on time 82% of the time, versus 86% across the IAD–MSY route.

It basically never cancels.

Out of 381 scheduled flights, only 0.3% were cancelled.

The breakdown

On-time by weekday
  • Mon93%(53 flights)
  • Tue89%(53 flights)
  • Wed83%(53 flights)
  • Thu82%(54 flights)
  • Fri75%(55 flights)
  • Sat81%(57 flights)
  • Sun71%(55 flights)
On-time by departure window
  • 6–9 AM94%(18 flights)
  • 9 AM–12 PM—(5 flights)
  • 12–3 PM—(9 flights)
  • 3–6 PM82%(341 flights)
  • 6–9 PM—(7 flights)
On-time trend by month
90%
May

Jun 65% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%31
July 202559%34
August 202577%31
September 202593%30
October 202597%31
November 202576%33
December 202568%31
January 202693%30
February 202682%28
March 202681%31
April 2026100%30
May 202690%40
Departures on time
83%
Diverted
0%
Flights flown
380
Months covered
12

Same route, other flights

Keep nerding

Based on 381 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.