BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
ALO→ORD

Waterloo, IA (ALO) to Chicago, IL (ORD) flight delay odds

69.4% of 663 official scheduled ALO-to-ORD flights arrived on time; 20.7% arrived at least 30 minutes late and 3.2% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALVariable
69.4%arrived on time
20.7%30+ min late
3.2%cancelled
663scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late11.5%all scheduled flights
120+ minutes late7.1%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+19.8 mincompleted flights

Which departure time was most reliable for ALO to ORD?

Among qualifying ALO-to-ORD departure window results, Early morning had the highest on-time rate: 78.8% of 363 flights. Afternoon was lowest at 58.4% across 298 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning36378.8%14.3%3.0%
Afternoon29858.4%28.2%3.4%

Which weekday was most reliable for ALO to ORD?

Among qualifying ALO-to-ORD weekday results, Tuesday had the highest on-time rate: 80.6% of 72 flights. Monday was lowest at 62.5% across 104 flights.

DayFlightsOn time30+ minCancelled
Monday10462.5%24.0%3.8%
Tuesday7280.6%13.9%0.0%
Wednesday10272.5%19.6%2.0%
Thursday10168.3%22.8%2.0%
Friday10366.0%24.3%2.9%
Saturday7775.3%14.3%5.2%
Sunday10465.4%22.1%5.8%

Which airline was most reliable for ALO to ORD?

Among qualifying ALO-to-ORD airline results, Envoy Air had the highest on-time rate: 70.3% of 617 flights. SkyWest Airlines was lowest at 56.5% across 46 flights.

AirlineFlightsOn time30+ minCancelled
Envoy Air61770.3%20.3%2.4%
SkyWest Airlines4656.5%26.1%13.0%

Which month was most reliable for ALO to ORD?

Among qualifying ALO-to-ORD month results, May 2026 had the highest on-time rate: 86.4% of 59 flights. December 2025 was lowest at 53.6% across 56 flights.

MonthFlightsOn time30+ minCancelled
July 20256159.0%29.5%1.6%
August 20255569.1%20.0%0.0%
September 20255280.8%15.4%0.0%
October 20256170.5%16.4%0.0%
November 20255474.1%16.7%5.6%
December 20255653.6%32.1%8.9%
January 20265461.1%33.3%0.0%
February 20264877.1%12.5%0.0%
March 20265364.2%20.8%5.7%
April 20265976.3%16.9%5.1%
May 20265986.4%10.2%0.0%
June 20265160.8%23.5%11.8%

What drove ALO to ORD delay minutes?

Late aircraft was the largest recorded ALO-to-ORD delay category, accounting for 33.9% of 18,890 BTS-attributed delay minutes during July 2025–June 2026.

Airline27.1%
Late aircraft33.9%
National airspace15.5%
Weather23.4%
Security0.1%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.