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Flight Reliability

DL 1143 · Delta Air Lines

Los Angeles → Houston (LAX–IAH)92% of its flights flew this route. The rest (IAH–LAX) are included in these numbers.

86
Pretty Reliable
WanderNerd Reliability Score
88%
Arrive within 15 minutes
2 min
Average arrival delay
1.0%
Cancelled
10 min early
Median arrival delay

Based on 397 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

DL 1143 departing between 6–9 AM arrived on time 91% of the time, versus 83% between 9 AM–12 PM.

Saturdays have been rough.

DL 1143 arrived on time 96% of the time on Mondays and just 75% on Saturdays. That gap is worth planning around.

A bit ahead of the LAX–IAH route.

DL 1143 arrived on time 88% of the time, versus 85% across the LAX–IAH route.

A bit ahead of the Delta Air Lines network.

DL 1143 arrived on time 88% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon96%(56 flights)
  • Tue86%(56 flights)
  • Wed89%(52 flights)
  • Thu93%(55 flights)
  • Fri89%(56 flights)
  • Sat75%(55 flights)
  • Sun88%(57 flights)
On-time by departure window
  • 6–9 AM91%(233 flights)
  • 9 AM–12 PM83%(123 flights)
  • 3–6 PM84%(31 flights)
On-time trend by month
82%
May

Jun 93% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%27
July 202589%28
August 202594%31
September 202593%30
October 202590%31
November 202587%30
December 202587%39
January 202691%33
February 202682%28
March 202686%29
April 202683%30
May 202682%51
Departures on time
89%
Diverted
1.5%
Flights flown
387
Months covered
12

Same route, other flights

Keep nerding

Based on 397 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.