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Flight Reliability

UA 4778 · United Airlines

Chicago → FAR (ORD–FAR)94% of its flights flew this route. The rest (FAR–ORD, ORD–MSN) are included in these numbers.

64
A Little Dicey
WanderNerd Reliability Score
69%
Arrive within 15 minutes
17 min
Average arrival delay
1.9%
Cancelled
1 min
Median arrival delay

Based on 372 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

UA 4778 departing between 12–3 PM arrived on time 91% of the time, versus 68% between 6–9 AM.

Friday is doing you no favors.

UA 4778 arrived on time 73% of the time on Thursdays. On Fridays: 63%.

Lagging the United Airlines network.

UA 4778 arrived on time 69% of the time, versus 79% across the United Airlines network.

Ticking up lately.

UA 4778 arrived on time 68% of the time over the last three months in the data, compared with 63% in the three months before that.

The breakdown

On-time by weekday
  • Mon71%(52 flights)
  • Tue69%(52 flights)
  • Wed69%(52 flights)
  • Thu73%(52 flights)
  • Fri63%(54 flights)
  • Sat71%(51 flights)
  • Sun68%(50 flights)
On-time by departure window
  • 6–9 AM68%(342 flights)
  • 12–3 PM91%(11 flights)
  • 3–6 PM80%(10 flights)
On-time trend by month
81%
May

Jun 83% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202568%31
August 202570%30
September 202569%29
October 202581%31
November 202564%28
December 202545%31
January 202668%28
February 202677%26
March 202652%31
April 202670%27
May 202681%41
Departures on time
78%
Diverted
0.5%
Flights flown
363
Months covered
12

Same route, other flights

Keep nerding

Based on 372 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.