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Flight Reliability

UA 6321 · United Airlines

Washington → Savannah (IAD–SAV)

88
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
1 min
Average arrival delay
0.8%
Cancelled
18 min early
Median arrival delay

Based on 242 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

UA 6321 departing between 6–9 AM arrived on time 92% of the time, versus 76% between 9 AM–12 PM.

Friday is doing you no favors.

UA 6321 arrived on time 93% of the time on Wednesdays. On Fridays: 80%.

Better than the United Airlines network average.

UA 6321 arrived on time 87% of the time, versus 79% across the United Airlines network.

Slipping a little lately.

UA 6321 arrived on time 93% of the time over the last three months in the data, compared with 96% in the three months before that.

The breakdown

On-time by weekday
  • Mon88%(41 flights)
  • Tue82%(28 flights)
  • Wed93%(28 flights)
  • Thu90%(39 flights)
  • Fri80%(40 flights)
  • Sat88%(25 flights)
  • Sun87%(37 flights)
On-time by departure window
  • 6–9 AM92%(159 flights)
  • 9 AM–12 PM76%(79 flights)
On-time trend by month
93%
May

Jun 73% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202577%31
August 202578%18
November 202585%27
December 202588%24
January 2026100%15
February 2026100%20
March 202696%26
April 202689%28
May 202693%14
Departures on time
85%
Diverted
0.8%
Flights flown
238
Months covered
11

Same route, other flights

Keep nerding

Based on 242 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.