Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 2634 · United Airlines

Atlanta → Washington (ATL–IAD)93% of its flights flew this route. The rest (ORD–MCO, IAD–ORD) are included in these numbers.

82
Pretty Reliable
WanderNerd Reliability Score
78%
Arrive within 15 minutes
13 min
Average arrival delay
0.6%
Cancelled
5 min early
Median arrival delay

Based on 334 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 2634 departing between 6–9 AM arrived on time 95% of the time, versus 77% between 6–9 PM.

Thursdays have been rough.

UA 2634 arrived on time 100% of the time on Saturdays and just 69% on Thursdays. That gap is worth planning around.

Recent months have been rougher.

UA 2634 arrived on time 76% of the time over the last three months in the data, compared with 91% in the three months before that.

The breakdown

On-time by weekday
  • Mon83%(52 flights)
  • Tue85%(52 flights)
  • Wed77%(52 flights)
  • Thu69%(51 flights)
  • Fri69%(52 flights)
  • Sat100%(20 flights)
  • Sun76%(53 flights)
On-time by departure window
  • 6–9 AM95%(19 flights)
  • 6–9 PM77%(311 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
63%
May

Jun 54% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%26
July 202562%26
August 202564%28
September 202583%29
October 202589%27
November 202582%27
December 202593%29
January 202692%26
February 202688%24
March 202674%31
April 202690%29
May 202663%30
Departures on time
77%
Diverted
0%
Flights flown
332
Months covered
12

Same route, other flights

Keep nerding

Based on 334 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.