ORD → LAS Flight Reliability

Right now

Origin · ORDNo disruption reported

Aviation weather is not currently a factor.

Updated 08:51 UTC

Chicago airport profile →

Destination · LASNo disruption reported

Aviation weather is not currently a factor.

Updated 08:56 UTC

Las Vegas airport profile →

Route reliability

July 2023 – July 2026

Route Reliability Score

63/ 100Good

Better than 42% of comparable major US routes (4,598 compared)

Calculated from 16,380 flights. How this is calculated

On-time arrivals

76.6%

12,384 of 16,169

Cancellation rate

1.07%

176 cancelled

Median arrival delay

-6 min

Average 6.9 min

Severe delays

8.3%

60+ minutes late

Delay when late

68 min

Average, when 15+ min late

Flights analyzed

16,380

5 carriers

ORD → LAS arrives on time 76.6% of the time; the return trip, LAS → ORD, arrives on time 79.6% of the time, a 3.0-point gap between the two directions of the same city pair.

ORD → LAS spends 31.5 minutes on the ground on a 1,514-mile trip: 23.4 minutes from pushback to wheels-up at ORD and 8.1 minutes from touchdown to gate at LAS.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

What stands out

The airline matters unusually much on this route, a wider carrier-to-carrier gap than 98% of 2,692 comparable routes.

United Airlines arrived on time 81.6% of the time, against 57.8% for Frontier Airlines, flying the exact same route.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 2,692 in the comparison.

Why ORD → LAS flights are cancelled

July 2023 – July 2026

ORD → LAS cancelled 176 of 16,380 scheduled flights — about 1 in every 93. The reason filed most often was extreme weather, 58.5% of the cancellations coded on this route — about 1 in every 159 scheduled flights.

Share of cancellations

Weather58.5%

Airline35.2%

Air traffic6.3%

Security0.0%

Of 176 cancelled departures carrying a reason code.

What each reason means

Extreme weather1 in 159

Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.

103 cancellations, 58.5% of the total.

The airline1 in 264

Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.

62 cancellations, 35.2% of the total.

The air traffic system1 in 1,489

Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.

11 cancellations, 6.3% of the total.

Security—

A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.

0 cancellations, 0.0% of the total.

Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.

176 coded cancellations were recorded on ORD → LAS; the section appears from 50.

When it goes wrong

July 2023 – July 2026

One arrival in ten is worse than

50 min late

against a median of 6 min early

Arrived an hour or more late8.3%

Typical delay when late68 min

Cancelled1.07%

Landed somewhere else0.21%

Percentiles over 16,380 operations; cancelled and diverted flights are counted separately.

Will your connection be tight enough?

Layovers at LAS after arriving from ORD.

Connection buffer and chance of missing by layover length, ORD → LAS arrivals
Connection time	Chance of missing	Reads as
30 min	39%	Likely to miss
45 min	23%	High risk
60 min	15%	High risk
90 min	8.1%	Some risk
120 min	4.7%	Low risk

This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.07% of the time and diverts 0.21% of the time, which a late arrival never shows up in.

Chance of missing is the share of 16,169 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.

The worst tenth of arrivals on this route land at least 50 minutes late (90th-percentile gate arrival delay), over 16,380 operations.

Any other layover length: connection checker.

Best time to fly

ORD → LAS flights departing 5–9 AM arrived on time 89.5% of the time, against 64.6% for 6–9 PM departures, a gap of 24.9 percentage points.

By day and hour

On-time arrival rate for each weekday and scheduled departure hour, in local time at the departure airport (ORD).

Hour of departure matters more than day of the week: hourly averages sit a typical 9.8 points from the route-wide rate, weekday averages 2.9 points.

On-time arrival rate for ORD to LAS by weekday and scheduled departure hour, local time. Each button reads out one slot.
Hour	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
7 AM–8 AM
8 AM–9 AM
9 AM–10 AM
10 AM–11 AM
11 AM–12 PM
12 PM–1 PM
1 PM–2 PM
2 PM–3 PM
3 PM–4 PM
4 PM–5 PM
5 PM–6 PM
6 PM–7 PM
7 PM–8 PM
8 PM–9 PM

On-time rate, % · stronger color, fewer on time

50–59
60–69
70–79
80–89
90–99

Fewer than 120 flights, not scored

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · On time is arrival within 15 minutes of schedule. Cells round to whole percentages; the table shows one decimal.

No slot is named best or worst: too few reach 500 flights. Departures before 7 AM and after 9 PM (1,807 flights) are not drawn: no slot in those hours has enough flights to score.

View as tableHide table

On-time arrival rate (%) with flights beneath, by scheduled departure hour and weekday for ORD to LAS. A dash means fewer than 120 flights, which are not scored.
Hour	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
7 AM–8 AM	89.2% on time260 flights	90.8% on time230 flights	92.6% on time232 flights	93.4% on time257 flights	90.7% on time260 flights	87.6% on time242 flights	88.2% on time249 flights
8 AM–9 AM	116 flights, too few to score	85.0% on time127 flights	85.9% on time128 flights	116 flights, too few to score	112 flights, too few to score	86.6% on time135 flights	83.7% on time126 flights
9 AM–10 AM	83.8% on time232 flights	82.4% on time223 flights	84.4% on time225 flights	84.5% on time234 flights	80.1% on time224 flights	84.2% on time215 flights	81.9% on time232 flights
10 AM–11 AM	76.7% on time194 flights	81.8% on time204 flights	78.2% on time208 flights	82.8% on time188 flights	72.8% on time204 flights	86.7% on time185 flights	76.6% on time201 flights
11 AM–12 PM	82.3% on time131 flights	112 flights, too few to score	108 flights, too few to score	80.8% on time120 flights	80.0% on time124 flights	114 flights, too few to score	105 flights, too few to score
12 PM–1 PM	113 flights, too few to score	105 flights, too few to score	114 flights, too few to score	115 flights, too few to score	113 flights, too few to score	105 flights, too few to score	79.7% on time129 flights
1 PM–2 PM	77.2% on time173 flights	85.0% on time162 flights	84.1% on time165 flights	79.7% on time175 flights	74.7% on time171 flights	83.2% on time165 flights	81.4% on time173 flights
2 PM–3 PM	63 flights, too few to score	52 flights, too few to score	54 flights, too few to score	55 flights, too few to score	59 flights, too few to score	31 flights, too few to score	48 flights, too few to score
3 PM–4 PM	75.4% on time170 flights	73.4% on time155 flights	69.2% on time156 flights	67.7% on time192 flights	62.9% on time176 flights	77.8% on time162 flights	70.7% on time186 flights
4 PM–5 PM	71.8% on time144 flights	114 flights, too few to score	114 flights, too few to score	66.4% on time148 flights	72.0% on time144 flights	79.7% on time140 flights	68.8% on time144 flights
5 PM–6 PM	89 flights, too few to score	75 flights, too few to score	89 flights, too few to score	77 flights, too few to score	88 flights, too few to score	59 flights, too few to score	85 flights, too few to score
6 PM–7 PM	94 flights, too few to score	86 flights, too few to score	87 flights, too few to score	87 flights, too few to score	106 flights, too few to score	74 flights, too few to score	86 flights, too few to score
7 PM–8 PM	62.3% on time193 flights	72.6% on time178 flights	68.6% on time172 flights	64.3% on time159 flights	59.0% on time184 flights	71.9% on time147 flights	58.5% on time181 flights
8 PM–9 PM	62.9% on time202 flights	69.0% on time149 flights	64.5% on time139 flights	58.8% on time211 flights	60.5% on time209 flights	68.1% on time196 flights	60.9% on time213 flights

By departure window

5–9 AM89.5%

9 AM–12 PM81.9%

12–3 PM78.1%

3–6 PM69.3%

6–9 PM64.6%

9 PM–5 AM65.4%

By departure hour

12 AM

3 AM

6 AM

9 AM

12 PM

3 PM

6 PM

9 PM

Why ORD → LAS runs late

July 2023 – July 2026

Late-arriving aircraft44.5%

the inbound aircraft was late, so this flight started late

The airline28.0%

crew, maintenance, boarding and fueling, all within the carrier’s control

Air traffic control22.2%

airspace and airport capacity, including weather-driven flow control

Weather5.2%

weather severe enough to stop this flight specifically

Security0.2%

screening or terminal security incidents

Share of the delay minutes US DOT attributed to each cause for ORD → LAS. Only delays of 15 minutes or more are attributed.

Late-arriving aircraft is the largest cause on ORD → LAS, at 44.5%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 89.5% of the time and 6–9 PM departures 64.6%.

How this route holds up in bad weather

July 2023 – July 2026

The harder-hit end is the one the flight leaves from, where a cancellation keeps it from departing at all. Bad weather cancels 5.5 times the normal rate at ORD against 2.4 times at LAS. Cancelled in bad weather against normal hours: ORD 6.5% against 1.2%, LAS 2.0% against 0.8%. Flights that did leave ORD in bad weather arrived on time 55.7% of the time, against 77.1% in normal hours.

Bad weather and normal hours at the airports

Scheduled departures, July 2023 – July 2026

Departures from ORD and LAS in hours of bad weather and in normal hours
Departures from	ORD	LAS
Cancelled in bad weather	6.5%	2.0%
Cancelled in normal hours	1.2%	0.8%
Arrived on time, bad weather	55.7%	58.5%
Arrived on time, normal hours	77.1%	78.5%
Departures in bad weather	104,455	14,522

United Airlines (3.5% cancelled against 7.4% for the other carriers at ORD) and American Airlines (5.4% cancelled against 6.7% for the other carriers at ORD) cancelled fewer departures from ORD in bad weather than the other carriers there did in the same months. None of the route’s other carriers was clearly worse.

This route’s airlines in bad weather at ORD

All departures from ORD

Cancellation rates in bad weather at ORD for the airlines that fly ORD to LAS, against the other carriers at ORD in the same months
Airline	Bad-weather departures	Cancelled	Other carriers
United Airlines	31,269	3.5%below the others	7.4%
Frontier Airlines	1,047	6.0%about level	7.5%
American Airlines	17,789	5.4%below the others	6.7%
Southwest Airlines	2,055	4.2%about level	5.1%
Spirit Airlines	2,378	4.8%about level	5.5%

These are airport figures, not route figures: every scheduled departure from ORD and LAS, to any destination, in hours the weather report called bad. The airline rows count each carrier’s departures from ORD on every route.

Weather source and limits. In full: ORD (airlines), LAS, What Weather Costs Each Airport, Who Cancels More When the Weather Turns, Airports That Change Places When Weather Turns.

Airlines on this route

Carriers with at least 200 flights, by the airline that operated each one.

Airlines on this route
Carrier	Flights	On time	Cancelled	Median delay	Severe
United Airlines	6,811	81.6%	0.75%	-8 min	6.3%
American Airlines	5,270	72.0%	1.23%	-4 min	9.9%
Southwest Airlines	1,961	74.5%	1.07%	-4 min	8.3%
Spirit Airlines	1,879	77.9%	0.85%	-7 min	7.9%
Frontier Airlines	459	57.8%	5.01%	6 min	19.7%

United Airlines flew 41.6% of the 16,380 flights listed. Frontier Airlines cancelled 5.01% of its flights here against 0.75% for United Airlines.

United Airlines arrived on time 23.8 percentage points more often than Frontier Airlines on this route.

Flights on this route

Flight numbers with at least 600 operations here and still on the schedule.

Flights on this route
Flight	Scheduled	Operations	On time
UA777 United Airlines	7:45 PM	1,126	76.6%

Weekly and seasonal patterns

By day of week

Mon75.6%

Tue80.1%

Wed79.2%

Thu75.1%

Fri72.8%

Sat80.3%

Sun73.9%

Saturday is historically the most reliable day and Friday the least, a gap of 7.5 percentage points.

By month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

July is historically the weakest month and November the strongest, a spread of 15.2 percentage points.

Reliability over time

July 2023 – July 2026

24

25

26

Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 74.0% against 79.5% in the 12 months before — declining by 5.5 percentage points.

Data and methodology

Calculated by FlyerIntel from 16,380 ORD → LAS flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.

Full methodology · Data sources · Report a problem

Analysis last recomputed September 26, 2026

ORD airport LAS airport Return direction LAS → ORD

ORD→LAS

Right now

Route reliability

What stands out

Why ORD → LAS flights are cancelled

Share of cancellations

What each reason means

When it goes wrong

Will your connection be tight enough?

Best time to fly

By day and hour

By departure window

By departure hour

Why ORD → LAS runs late

How this route holds up in bad weather

Bad weather and normal hours at the airports

This route’s airlines in bad weather at ORD

Airlines on this route

Flights on this route

Weekly and seasonal patterns

By day of week

By month

Reliability over time

Data and methodology