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Flight Reliability

UA 3688 · United Airlines

New York → Washington (LGA–IAD)85% of its flights flew this route. The rest (PIT–EWR, SAV–EWR) are included in these numbers.

43
Bring Snacks
WanderNerd Reliability Score
65%
Arrive within 15 minutes
25 min
Average arrival delay
5.8%
Cancelled
1 min early
Median arrival delay

Based on 343 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 3688 departing between 6–9 AM arrived on time 91% of the time, versus 62% between 12–3 PM.

Thursdays have been rough.

UA 3688 arrived on time 85% of the time on Saturdays and just 52% on Thursdays. That gap is worth planning around.

Lagging the LGA–IAD route.

UA 3688 arrived on time 65% of the time, versus 75% across the LGA–IAD route.

Lagging the United Airlines network.

UA 3688 arrived on time 65% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon61%(44 flights)
  • Tue65%(46 flights)
  • Wed70%(46 flights)
  • Thu52%(48 flights)
  • Fri57%(46 flights)
  • Sat85%(48 flights)
  • Sun64%(45 flights)
On-time by departure window
  • 6–9 AM91%(32 flights)
  • 12–3 PM62%(268 flights)
  • 3–6 PM65%(20 flights)
  • 6–9 PM—(3 flights)
On-time trend by month
70%
May

Jun 90% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202546%26
August 202560%30
September 202557%30
October 202568%31
November 202558%26
December 202566%29
January 202666%29
February 202681%26
March 202648%27
April 202680%10
May 202670%30
Departures on time
71%
Diverted
0%
Flights flown
323
Months covered
12

Same route, other flights

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Based on 343 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.