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Flight Reliability

UA 1738 · United Airlines

Washington → Chicago (IAD–ORD)95% of its flights flew this route. The rest (SFO–IAD) are included in these numbers.

82
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
8 min
Average arrival delay
1.3%
Cancelled
6 min early
Median arrival delay

Based on 380 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 84% of the time, against 80% between 9 PM–12 AM.

Thursday is the weak spot.

UA 1738 arrived on time 87% of the time on Tuesdays. On Thursdays: 76%.

A bit ahead of the IAD–ORD route.

UA 1738 arrived on time 81% of the time, versus 76% across the IAD–ORD route.

Recent months have been rougher.

UA 1738 arrived on time 75% of the time over the last three months in the data, compared with 84% in the three months before that.

The breakdown

On-time by weekday
  • Mon83%(53 flights)
  • Tue87%(53 flights)
  • Wed80%(54 flights)
  • Thu76%(54 flights)
  • Fri78%(55 flights)
  • Sat78%(51 flights)
  • Sun82%(54 flights)
On-time by departure window
  • 9 AM–12 PM84%(19 flights)
  • 9 PM–12 AM80%(355 flights)
On-time trend by month
81%
May

Jun 83% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202561%31
August 202583%30
September 202596%27
October 202587%31
November 202579%28
December 202582%45
January 202680%35
February 202689%28
March 202675%28
April 202670%30
May 202681%31
Departures on time
81%
Diverted
0.3%
Flights flown
374
Months covered
12

Same route, other flights

Keep nerding

Based on 380 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.