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Flight Reliability

UA 4554 · United Airlines

Chicago → GRB (ORD–GRB)85% of its flights flew this route. The rest (ORD–GSP, IAD–CLE) are included in these numbers.

70
Usually Fine
WanderNerd Reliability Score
69%
Arrive within 15 minutes
20 min
Average arrival delay
0.4%
Cancelled
2 min early
Median arrival delay

Based on 268 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 73% of the time, against 69% between 12–3 PM.

Sunday scaries are real for this one.

UA 4554 arrived on time 75% of the time on Tuesdays and just 53% on Sundays. That gap is worth planning around.

Lagging the United Airlines network.

UA 4554 arrived on time 69% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 4554 arrived on time 69% of the time over the last three months in the data, compared with 57% in the three months before that.

The breakdown

On-time by weekday
  • Mon73%(33 flights)
  • Tue75%(36 flights)
  • Wed70%(40 flights)
  • Thu70%(37 flights)
  • Fri68%(38 flights)
  • Sat74%(43 flights)
  • Sun53%(40 flights)
On-time by departure window
  • 6–9 AM73%(30 flights)
  • 12–3 PM69%(236 flights)
  • 3–6 PM—(1 flights)
On-time trend by month
63%
May

Jun 64% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%11
July 202573%30
August 202577%30
September 202586%28
October 202568%22
December 202558%19
January 202644%27
February 202668%28
April 202677%30
May 202663%30
Departures on time
72%
Diverted
0%
Flights flown
267
Months covered
12

Same route, other flights

Keep nerding

Based on 268 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.