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Flight Reliability

UA 2040 · United Airlines

Boston → Chicago (BOS–ORD)81% of its flights flew this route. The rest (ORD–DEN, ORD–MCI) are included in these numbers.

39
Bring Snacks
WanderNerd Reliability Score
50%
Arrive within 15 minutes
31 min
Average arrival delay
2.0%
Cancelled
16 min
Median arrival delay

Based on 443 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 2040 departing between 3–6 PM arrived on time 52% of the time, versus 41% between 6–9 PM.

Wednesdays have been rough.

UA 2040 arrived on time 61% of the time on Tuesdays and just 46% on Wednesdays. That gap is worth planning around.

Well behind the BOS–ORD route.

UA 2040 arrived on time 50% of the time, versus 73% across the BOS–ORD route.

Well behind the United Airlines network.

UA 2040 arrived on time 50% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon48%(60 flights)
  • Tue61%(62 flights)
  • Wed46%(63 flights)
  • Thu47%(62 flights)
  • Fri47%(60 flights)
  • Sat51%(63 flights)
  • Sun48%(64 flights)
On-time by departure window
  • 3–6 PM52%(353 flights)
  • 6–9 PM41%(79 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
81%
May

Jun 42% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202542%60
July 202534%59
August 202549%47
September 202540%30
October 202545%31
November 202557%30
December 202555%31
January 202646%28
February 202663%27
March 202653%30
April 202657%30
May 202681%31
Departures on time
75%
Diverted
0%
Flights flown
434
Months covered
12

Same route, other flights

Keep nerding

Based on 443 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.