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Flight Reliability

UA 1977 · United Airlines

Houston → Boston (IAH–BOS)

100
Nerd Approved
WanderNerd Reliability Score
95%
Arrive within 15 minutes
6 min early
Average arrival delay
0.8%
Cancelled
10 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Skip Tuesday if you can.

UA 1977 arrived on time 100% of the time on Fridays. On Tuesdays: 90%.

Well ahead of the IAH–BOS route.

UA 1977 arrived on time 95% of the time, versus 73% across the IAH–BOS route.

Well ahead of the United Airlines network.

UA 1977 arrived on time 95% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon96%(50 flights)
  • Tue90%(51 flights)
  • Wed94%(51 flights)
  • Thu92%(52 flights)
  • Fri100%(51 flights)
  • Sat90%(52 flights)
  • Sun100%(53 flights)
On-time trend by month
90%
May

Jun 93% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202597%31
August 2025100%31
September 202593%30
October 202590%31
November 202597%29
December 202597%31
January 202687%30
February 202696%25
March 2026100%31
April 202697%30
May 202690%31
Departures on time
92%
Diverted
0%
Flights flown
360
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.