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Flight Reliability

UA 747 · United Airlines

Seattle → Chicago (SEA–ORD)

83
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
6 min
Average arrival delay
0.8%
Cancelled
10 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

UA 747 departing between 6–9 AM arrived on time 87% of the time, versus 63% between 12–3 PM.

Sunday scaries are real for this one.

UA 747 arrived on time 85% of the time on Thursdays and just 69% on Sundays. That gap is worth planning around.

A bit ahead of the SEA–ORD route.

UA 747 arrived on time 81% of the time, versus 76% across the SEA–ORD route.

The breakdown

On-time by weekday
  • Mon82%(51 flights)
  • Tue83%(52 flights)
  • Wed85%(52 flights)
  • Thu85%(48 flights)
  • Fri83%(52 flights)
  • Sat82%(51 flights)
  • Sun69%(51 flights)
On-time by departure window
  • 6–9 AM87%(37 flights)
  • 9 AM–12 PM81%(113 flights)
  • 12–3 PM63%(16 flights)
  • 9 PM–12 AM82%(191 flights)
On-time trend by month
87%
May

Jun 62% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202562%29
July 202557%30
August 202566%29
September 202590%30
October 2025100%31
November 202579%29
December 202577%31
January 202687%31
February 202696%28
March 202690%30
April 202683%29
May 202687%30
Departures on time
79%
Diverted
0.8%
Flights flown
357
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.