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Flight Reliability

UA 1237 · United Airlines

Minneapolis → Chicago (MSP–ORD)84% of its flights flew this route. The rest (ORD–PHX, EWR–RSW) are included in these numbers.

31
Bring Snacks
WanderNerd Reliability Score
52%
Arrive within 15 minutes
51 min
Average arrival delay
1.7%
Cancelled
15 min
Median arrival delay

Based on 294 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 1237 departing between 6–9 AM arrived on time 100% of the time, versus 48% between 6–9 PM.

Sunday scaries are real for this one.

UA 1237 arrived on time 67% of the time on Saturdays and just 42% on Sundays. That gap is worth planning around.

Well behind the MSP–ORD route.

UA 1237 arrived on time 52% of the time, versus 71% across the MSP–ORD route.

Well behind the United Airlines network.

UA 1237 arrived on time 52% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon58%(43 flights)
  • Tue55%(31 flights)
  • Wed58%(40 flights)
  • Thu46%(54 flights)
  • Fri50%(52 flights)
  • Sat67%(18 flights)
  • Sun42%(50 flights)
On-time by departure window
  • 3–6 AM—(2 flights)
  • 6–9 AM100%(11 flights)
  • 9 AM–12 PM—(6 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM—(5 flights)
  • 6–9 PM48%(245 flights)
  • 9 PM–12 AM56%(18 flights)
On-time trend by month
70%
May

Jun 50% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%14
July 202536%22
August 202554%24
September 202533%18
October 202548%27
November 202550%24
December 202548%29
January 202650%16
February 202671%21
March 202658%26
April 202648%40
May 202670%27
Departures on time
69%
Diverted
0.3%
Flights flown
288
Months covered
12

Same route, other flights

Keep nerding

Based on 294 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.