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Route on-time record

ORD to SAT: most on-time flights and the best time to fly

Chicago (Chicago O'Hare International Airport) to San Antonio (San Antonio International Airport). 1,960 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was United 202 at 9:10 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

ORD → SAT

Chicago to San Antonio: 1,960 nonstop flights a year

On time (12 months)

75%

Cancelled

1.9%

avg delay 19 min

Best time to leave

Before 9 AM

93% on time vs 65% 6 to 9 PM

Most reliable airline

SkyWest

77% chance on time

Check ORD to SAT fares

Lowest nonstop fare seen in the next two months: $163 (United 1394 on 2026-10-21). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · United 202

    9:10 AM → 12:12 PM3h 02m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 490; its record covers all of them.

    86%

    chance on time

    On time (history)
    87%
    Cancelled
    0.3%
    Avg arrival delay
    8 min
    • Arrived on time 87% of the time (324 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Strong track record · 324 flights

    Find United 202 fares Opens this date on Aviasales

  2. #2 · Envoy 4147 · sold as American Eagle

    9:40 AM → 12:49 PM3h 09m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    84%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 86% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (44 flights), so its score leans on the airline's record at this hour.

    Limited track record · 44 flights

    Find 9:40 AM flight fares Opens this date on Aviasales

  3. #3 · Republic 4667 · sold as American Eagle, Delta Connection or United Express

    1:20 PM → 4:30 PM3h 10m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    80%

    chance on time

    On time (history)
    85%
    Cancelled
    6.3%
    Avg arrival delay
    7 min
    • Arrived on time 85% of the time (59 flights, Jun 2025 to May 2026).
    • Cancelled 6.3% of the time (4 of 63).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (59 flights), so its score leans on the airline's record at this hour.

    Limited track record · 59 flights

    Find 1:20 PM flight fares Opens this date on Aviasales

  4. #4 · Envoy 4186 · sold as American Eagle

    2:36 PM → 5:44 PM3h 08m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    80%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 84% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (44 flights), so its score leans on the airline's record at this hour.

    Limited track record · 44 flights

    Find 2:36 PM flight fares Opens this date on Aviasales

  5. #5 · Envoy 3607 · sold as American Eagle

    9:50 AM → 1:01 PM3h 11m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    77%

    chance on time

    On time (history)
    76%
    Cancelled
    0.0%
    Avg arrival delay
    16 min
    • Arrived on time 76% of the time (45 flights, Jun 2025 to May 2026).
    • Never cancelled in 45 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (45 flights), so its score leans on the airline's record at this hour.

    Limited track record · 45 flights

    Find 9:50 AM flight fares Opens this date on Aviasales

  6. #6 · SkyWest 5535 · sold as United Express, Delta Connection, American Eagle or Alaska

    1:19 PM → 4:43 PM3h 24m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    76%

    chance on time

    On time (history)
    70%
    Cancelled
    4.8%
    Avg arrival delay
    15 min
    • Arrived on time 70% of the time (20 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (20 flights), so its score leans on the airline's record at this hour.

    Limited track record · 20 flights

    Find 1:19 PM flight fares Opens this date on Aviasales

  7. #7 · United 2844

    1:03 PM → 4:03 PM3h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1719; its record covers all of them.

    76%

    chance on time

    On time (history)
    70%
    Cancelled
    0.0%
    Avg arrival delay
    28 min
    • Arrived on time 70% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • 83% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 33 flights

    Find United 2844 fares Opens this date on Aviasales

  8. #8 · American 2486

    9:53 AM → 12:45 PM2h 52m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    76%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    32 min
    • Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • 92% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find American 2486 fares Opens this date on Aviasales

  9. #9 · United 2221

    1:10 PM → 4:19 PM3h 09m nonstop

    Local times, typical schedule. Last flown 2026-05-18.

    72%

    chance on time

    On time (history)
    50%
    Cancelled
    0.0%
    Avg arrival delay
    21 min
    • Arrived on time 50% of the time (12 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (12 flights), so its score leans on the airline's record at this hour.

    Limited track record · 12 flights

    Find United 2221 fares Opens this date on Aviasales

  10. #10 · Envoy 4176 · sold as American Eagle

    2:48 PM → 5:57 PM3h 09m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    72%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    32 min
    • Arrived on time 64% of the time (11 flights, Jun 2025 to May 2026).
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 57% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find 2:48 PM flight fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)77%

    146 flights · 82% on time as flown · 2.3% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)77%

    99 flights · 82% on time as flown · 2.7% cancel

  • Envoy Air (sold as American Eagle)75%

    322 flights · 76% on time as flown · 2.3% cancel

  • United Airlines75%

    811 flights · 76% on time as flown · 1.1% cancel

  • American Airlines67%

    582 flights · 69% on time as flown · 2.2% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM93%

    133 flights · avg delay 6 min

  • 9 AM to noon82%

    563 flights · avg delay 11 min

  • Noon to 3 PM75%

    571 flights · avg delay 18 min

  • 6 to 9 PM65%

    661 flights · avg delay 29 min

Best day: Tuesday (78%). Worst: Friday (72%).

Smarter routing

Nearby airports that run more on time

  • MDW → SAT 77% chance on time

    Chicago Midway International Airport to San Antonio International Airport · 685 flights a year · 15 mi from your airports · yours: 73%

    Rank flightsFares

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
68
F
81
M
75
A
69
M
69
J
66
J
63
A
75
S
83
O
86
N
83
D
80

What delays this route

  • Late-arriving aircraft52%
  • Airline (crew, maintenance, boarding)26%
  • Air traffic control and airport volume16%
  • Severe weather6%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

ORD to SAT questions

What time of day is best to fly ORD to SAT?
Before 9 AM: 93% of flights arrived on time, against 65% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from ORD to SAT?
SkyWest, with a season-adjusted 77% chance of operating and arriving on time over 146 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on ORD to SAT?
July (63% on time); the best was October (86%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from ORD

Live status: FAA delays and ground stops