Carrier route record

MQORD→SAT

Envoy Air · Chicago to San Antonio

Flights: 410
Period: September 2025 to August 2026
Share of route: 20%
Carriers: 5

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Envoy Air.

Envoy on ORD to SAT lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 410 flights. The strongest carrier on the route with a full sample, United Airlines, flew 889 at 74.0% on time.

The US average over the same twelve months is 77.3%, so there is little to separate Envoy on ORD to SAT from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

76.3%

Arrivals under 15 minutes late, of 397 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

2.44%

National rate is 1.89%

Whole route

72.7%

Every carrier on ORD to SAT, 2,001 flights

These figures cover 410 flights between September 2025 and August 2026. Beyond the headline rate, 10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Envoy against every carrier on ORD to SAT

Envoy flew 410 of the 2,001 flights on ORD to SAT, about 20% of it. Its 76.3% on time is 4 points better than the route as a whole, which runs 72.7%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from Republic at 82.3% to American at 64.3%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. United Airlines arrives on time 74.0% of the time; American Airlines manages 64.3%. Sample sizes sit next to every figure, because a two-point gap across 497 flights means less than a ten-point one.

On-time performance by carrier on ORD to SAT
Airline	Flights	On time	Avg delay	Cancelled	Grade
Republic Airwaysthin sample	101	82.3%	62 min	3.96%	B−
SkyWest Airlinesthin sample	104	79.0%	61 min	3.85%	B−
Envoy Air (this page)	410	76.3%	62 min	2.44%	B
United Airlines	889	74.0%	73 min	0.90%	C+
American Airlines	497	64.3%	86 min	1.81%	D

United leads American by 10 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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Departure window

When Envoy runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 410 flights.

5am–8am—
8am–11am108 flights79.2%
11am–2pm60 flights77.2%
2pm–5pm143 flights78.0%
5pm–8pm1 flights—
8pm–5am98 flights70.7%

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 79.2% of the time, against 70.7% for the overnight window. That is 9 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 143 flights scheduled in it.

Across the year

Envoy on ORD to SAT through the year

Jan–Mar 2026168 flights74.7%
Apr–Jun 2026184 flights78.7%
Jul–Sep 202658 flights73.7%

Scale runs 65% to 85%.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 76.3% on time across 410 flights.

Quarter by quarter Envoy on ORD to SAT held fairly steady: 74.7% in Jan–Mar 2026, 78.7% in Apr–Jun 2026 and 73.7% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Across the week, Thursday is the strongest day at 83.3% on time and Saturday the weakest at 62.2%, a spread of 21 points.

Arrival by arrival

How late Envoy on ORD to SAT runs when it is late

Envoy on ORD to SAT often beats the schedule: 152 of 397 completed flights, 38%, arrived 15 minutes or more early. The 94 late arrivals split 25 under half an hour, 28 between 30 and 60 minutes, and 41 an hour or more.

15+ min early152 flights38.3%
Within 15 min151 flights38.0%
15–29 min late25 flights6.3%
30–59 min late28 flights7.1%
1–2 hours late30 flights7.6%
2+ hours late11 flights2.8%

Scale runs 0% to 100%.

Share of 397 completed flights by arrival against schedule.

22 of 84 late departures made up the time and arrived on time, 26% of them. In the other direction, 32 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SAT.

The worst days

Worst days for Envoy on ORD to SAT

The latest arrival of the period was on 2 February 2026, 4 hours 18 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.

The latest arrivals of Envoy on ORD to SAT in the period
Date	Arrived late by	Largest filed cause
2 February 2026	4 hours 18 minutes	Late-arriving aircraft
9 August 2026	3 hours 27 minutes	Late-arriving aircraft
22 May 2026	2 hours 30 minutes	Late-arriving aircraft
10 March 2026	2 hours 26 minutes	Late-arriving aircraft
27 July 2026	2 hours 26 minutes	Late-arriving aircraft

Delay causes

Why Envoy runs late on this route

Late-arriving aircraft accounts for 50% of the 5,826 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
50%
National Airspace System
33%
Carrier
9%
Extreme weather
8%

50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,826 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 5,826 reported delay minutes.

33% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,922 minutes out of 5,826, against a national NAS share of 21%.

Cancellations sit at 2.44% against a national 1.89%, which is ordinary. Diversions add another 0.73%.

Connections and stage length

What a delay here costs

10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

The 1,041 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.

The return leg runs 76.1% on time across 410 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 410 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking Envoy on ORD to SAT

Put together: treat all of this as provisional. 410 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 76.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 397 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures