Skip to content
WanderNerd
Check a flight

Route Reliability

Houston → San Juan

IAH–SJU · 2,007 miles · George Bush Intercontinental Airport to Luis Muñoz Marín International Airport

86
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
4 min
Average arrival delay
0.6%
Cancelled
960
Flights in the data

Data through May 2026.

Airlines on this route

  • United Airlines83% on time · 872 flights
  • Spirit Airlines62% on time · 88 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

The 3–6 PM departure wins.

IAH–SJU flights departing between 3–6 PM arrived on time 85% of the time, versus 76% between 9 AM–12 PM.

Sunday scaries are real for this one.

IAH–SJU flights arrived on time 89% of the time on Tuesdays and just 73% on Sundays. That gap is worth planning around.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon83%(121 flights)
  • Tue89%(131 flights)
  • Wed81%(118 flights)
  • Thu80%(145 flights)
  • Fri87%(133 flights)
  • Sat76%(145 flights)
  • Sun73%(161 flights)
On-time by departure window
  • 9 AM–12 PM76%(394 flights)
  • 12–3 PM—(9 flights)
  • 3–6 PM85%(406 flights)
  • 6–9 PM—(4 flights)
  • 9 PM–12 AM84%(141 flights)
On-time trend by month
82%
May

Jun 76% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%103
July 202570%111
August 202569%93
September 202590%68
October 202586%70
November 202575%68
December 202577%91
January 202692%76
February 202691%67
March 202682%74
April 202693%60
May 202682%73

Same trip, other airports

Keep nerding

Based on 960 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.