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Route Reliability

San Francisco → Houston

SFO–IAH · 1,635 miles · San Francisco International Airport to George Bush Intercontinental Airport

90
Nerd Approved
WanderNerd Reliability Score
86%
Arrive within 15 minutes
1 min
Average arrival delay
0.4%
Cancelled
3,596
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 86% of the time across 3,596 flights. No comparison to make.

What the data says

The 3–6 AM departure wins.

SFO–IAH flights departing between 3–6 AM arrived on time 97% of the time, versus 78% between 9 AM–12 PM.

Tuesday has been the better bet.

A small edge: 88% on time on Tuesdays against 83% on Mondays.

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%(517 flights)
  • Tue88%(498 flights)
  • Wed86%(516 flights)
  • Thu84%(514 flights)
  • Fri86%(503 flights)
  • Sat86%(497 flights)
  • Sun85%(521 flights)
On-time by departure window
  • 12–3 AM90%(359 flights)
  • 3–6 AM97%(357 flights)
  • 6–9 AM95%(393 flights)
  • 9 AM–12 PM78%(687 flights)
  • 12–3 PM80%(721 flights)
  • 3–6 PM84%(368 flights)
  • 6–9 PM88%(315 flights)
  • 9 PM–12 AM84%(366 flights)
On-time trend by month
81%
May

Jun 80% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%286
July 202583%293
August 202582%297
September 202592%289
October 202591%304
November 202582%297
December 202585%311
January 202686%300
February 202688%277
March 202688%307
April 202689%299
May 202681%306

Same trip, other airports

Keep nerding

Based on 3,596 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.