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Flight Reliability

UA 4840 · United Airlines

Washington → CHO (IAD–CHO)94% of its flights flew this route. The rest (SGF–IAH, IAH–MOB) are included in these numbers.

46
Bring Snacks
WanderNerd Reliability Score
69%
Arrive within 15 minutes
48 min
Average arrival delay
2.9%
Cancelled
7 min early
Median arrival delay

Based on 280 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 4840 departing between 3–6 PM arrived on time 78% of the time, versus 46% between 12–3 PM.

Wednesdays have been rough.

UA 4840 arrived on time 85% of the time on Tuesdays and just 61% on Wednesdays. That gap is worth planning around.

Lagging the IAD–CHO route.

UA 4840 arrived on time 69% of the time, versus 79% across the IAD–CHO route.

Lagging the United Airlines network.

UA 4840 arrived on time 69% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon68%(38 flights)
  • Tue85%(39 flights)
  • Wed61%(38 flights)
  • Thu72%(39 flights)
  • Fri62%(37 flights)
  • Sat65%(37 flights)
  • Sun68%(44 flights)
On-time by departure window
  • 12–3 PM46%(11 flights)
  • 3–6 PM78%(82 flights)
  • 6–9 PM66%(179 flights)
On-time trend by month
52%
May

Jun 60% → May 52% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%25
October 202581%31
November 202582%28
December 202569%29
January 202645%29
February 202693%28
March 202666%29
April 202667%30
May 202652%31
Departures on time
68%
Diverted
0%
Flights flown
272
Months covered
12

Same route, other flights

Keep nerding

Based on 280 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.