Skip to content
WanderNerd
Check a flight

Route Reliability

San Juan → Chicago

SJU–ORD · 2,072 miles · Luis Muñoz Marín International Airport to Chicago O'Hare International Airport

75
Usually Fine
WanderNerd Reliability Score
81%
Arrive within 15 minutes
5 min
Average arrival delay
2.1%
Cancelled
1,423
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines84%665 flights
  2. 2.Spirit Airlines82%320 flights
  3. 3.American Airlines74%426 flights

Not enough history to rank: Frontier Airlines (12 flights). We rank airlines only after 100 flights on the route.

What the data says

Morning flights do better here.

SJU–ORD flights departing between 6–9 AM arrived on time 94% of the time, versus 72% between 3–6 PM.

Monday is the weak spot.

SJU–ORD flights arrived on time 84% of the time on Wednesdays. On Mondays: 76%.

United Airlines runs this route best.

United Airlines arrived on time 84% of the time on this route; American Airlines managed 74%.

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
  • Mon76%(205 flights)
  • Tue78%(195 flights)
  • Wed84%(172 flights)
  • Thu80%(196 flights)
  • Fri84%(206 flights)
  • Sat82%(203 flights)
  • Sun81%(198 flights)
On-time by departure window
  • 12–3 AM87%(31 flights)
  • 3–6 AM84%(25 flights)
  • 6–9 AM94%(421 flights)
  • 9 AM–12 PM81%(53 flights)
  • 12–3 PM72%(105 flights)
  • 3–6 PM72%(660 flights)
  • 6–9 PM81%(80 flights)
On-time trend by month
84%
May

Jun 86% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%116
July 202586%125
August 202575%114
September 202574%50
October 202569%73
November 202575%99
December 202580%127
January 202678%140
February 202685%138
March 202678%160
April 202687%131
May 202684%102

Same trip, other airports

Keep nerding

Based on 1,423 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.