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

Chicago, IL (ORD) to Billings, MT (BIL) flight delay odds

81.7% of 378 official scheduled ORD-to-BIL flights arrived on time; 9.3% arrived at least 30 minutes late and 0.5% 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 SIGNALLower disruption
81.7%arrived on time
9.3%30+ min late
0.5%cancelled
378scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.2%all scheduled flights
120+ minutes late1.1%all scheduled flights
Diverted0.5%did not reach as scheduled
Average arrival+1.3 mincompleted flights

Which departure time was most reliable for ORD to BIL?

Among qualifying ORD-to-BIL departure window results, Early morning had the highest on-time rate: 88.2% of 68 flights. Evening was lowest at 74.2% across 93 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning6888.2%5.9%0.0%
Late morning21382.6%8.5%0.0%
Evening9374.2%14.0%2.2%

Which weekday was most reliable for ORD to BIL?

Among qualifying ORD-to-BIL weekday results, Tuesday had the highest on-time rate: 90.9% of 55 flights. Saturday was lowest at 78.2% across 55 flights.

DayFlightsOn time30+ minCancelled
Monday5280.8%11.5%0.0%
Tuesday5590.9%5.5%0.0%
Wednesday5479.6%9.3%0.0%
Thursday5580.0%7.3%1.8%
Friday5479.6%11.1%0.0%
Saturday5578.2%16.4%1.8%
Sunday5383.0%3.8%0.0%

Which airline was most reliable for ORD to BIL?

Among qualifying ORD-to-BIL airline results, Envoy Air had the highest on-time rate: 82.4% of 261 flights. SkyWest Airlines was lowest at 80.3% across 117 flights.

AirlineFlightsOn time30+ minCancelled
Envoy Air26182.4%9.6%0.8%
SkyWest Airlines11780.3%8.5%0.0%

Which month was most reliable for ORD to BIL?

Among qualifying ORD-to-BIL month results, June 2026 had the highest on-time rate: 100.0% of 30 flights. July 2025 was lowest at 65.6% across 93 flights.

MonthFlightsOn time30+ minCancelled
July 20259365.6%19.4%1.1%
August 20259384.9%4.3%1.1%
September 20259083.3%10.0%0.0%
October 20256088.3%5.0%0.0%
June 202630100.0%0.0%0.0%

What drove ORD to BIL delay minutes?

Late aircraft was the largest recorded ORD-to-BIL delay category, accounting for 42.6% of 3,607 BTS-attributed delay minutes during July 2025–June 2026.

Airline35.3%
Late aircraft42.6%
National airspace13.4%
Weather8.6%
Security0.0%
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.