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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

GSP → ORD

Greenville/Greer/Spartanburg to Chicago: 1,766 nonstop flights a year

On time (12 months)

75%

Cancelled

3.7%

avg delay 19 min

Best time to leave

9 AM to noon

85% on time vs 58% 3 to 6 PM

Most reliable airline

Republic

82% chance on time

Check GSP to ORD fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

11 nonstop, 29 with 1 connection. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.

  1. Best overall#1 · Nonstop · 2h 24m

    6:30 AM → 7:54 AM

    85%

    arrive on time

    6:30 AM GSP → 7:54 AM ORD2h 24m

    Republic 3439 · sold as American Eagle, Delta Connection or United Express

    Embraer E175 · 2–11 yrs old
    88% on time · 2.4% cancel
    Find 6:30 AM flight fares Opens this date on Aviasales

  2. #2 · Nonstop · 2h 23m

    6:30 AM → 7:53 AM

    81%

    arrive on time

    6:30 AM GSP → 7:53 AM ORD2h 23m

    SkyWest 5930 · sold as United Express, Delta Connection, American Eagle or Alaska

    Embraer E175 · 6–11 yrs old
    86% on time · 5.3% cancel
    Find 6:30 AM flight fares Opens this date on Aviasales

  3. #3 · Nonstop · 2h 17m

    10:40 AM → 11:57 AM

    80%

    arrive on time

    10:40 AM GSP → 11:57 AM ORD2h 17m

    SkyWest 5312 · sold as United Express, Delta Connection, American Eagle or Alaska

    Bombardier CRJ550 · 16–22 yrs old
    83% on time · 4.1% cancel
    Find 10:40 AM flight fares Opens this date on Aviasales

  4. #4 · Nonstop · 2h 27m

    7:20 AM → 8:47 AM

    77%

    arrive on time

    7:20 AM GSP → 8:47 AM ORD2h 27m

    Envoy 3676 · sold as American Eagle

    Embraer E170 · 20–22 yrs old
    80% on time · 3.1% cancel
    Find 7:20 AM flight fares Opens this date on Aviasales

  5. #5 · Nonstop · 2h 26m

    7:30 AM → 8:56 AM

    76%

    arrive on time

    7:30 AM GSP → 8:56 AM ORD2h 26m

    Envoy 3603 · sold as American Eagle

    Embraer E175 · 5–11 yrs old
    79% on time · 3.4% cancel
    Find 7:30 AM flight fares Opens this date on Aviasales

  6. #6 · Nonstop · 2h 14m

    11:34 AM → 12:48 PM

    75%

    arrive on time

    11:34 AM GSP → 12:48 PM ORD2h 14m

    Envoy 3556 · sold as American Eagle · also flew as 3918

    Embraer E170 or E175 · 5–22 yrs old
    77% on time · 2.0% cancel
    Find 11:34 AM flight fares Opens this date on Aviasales

  7. #7 · Nonstop · 2h 24m

    6:36 AM → 8:00 AM

    75%

    arrive on time

    6:36 AM GSP → 8:00 AM ORD2h 24m

    SkyWest 5620 · sold as United Express, Delta Connection, American Eagle or Alaska

    Embraer E175 · 9–12 yrs old
    79% on time · 4.7% cancel
    Find 6:36 AM flight fares Opens this date on Aviasales

  8. #8 · Nonstop · 2h 16m

    7:40 AM → 8:56 AM

    73%

    arrive on time

    7:40 AM GSP → 8:56 AM ORD2h 16m

    American 1401

    Airbus A319 · 23–27 yrs old
    78% on time · 6.3% cancel
    Find American 1401 fares Opens this date on Aviasales

  9. #9 · Nonstop · 2h 14m

    10:46 AM → 12:00 PM

    72%

    arrive on time

    10:46 AM GSP → 12:00 PM ORD2h 14m

    SkyWest 5361 · sold as United Express, Delta Connection, American Eagle or Alaska

    Bombardier CRJ550 · 16–23 yrs old
    75% on time · 4.4% cancel
    Find 10:46 AM flight fares Opens this date on Aviasales

  10. #10 · 1 connection · 6h 00m · one ticket (American)

    7:00 AM → 12:00 PM

    92%

    connections made

    84%

    arrive on time

    7:00 AM GSP → 8:12 AM CLT1h 12m

    PSA 5654 · sold as American Eagle · also flew as 5434, 5589

    Bombardier CRJ900 · 9–12 yrs old
    89% on time · 1.9% cancel
    Connect in CLT · 2h 22m · 96% chance to make it · same ticket: the airline rebooks you if you miss it

    10:34 AM CLT → 12:00 PM ORD2h 26m

    Republic 3509 · sold as American Eagle · also flew as 3702

    Embraer E175 · 2–11 yrs old
    92% on time · 2.4% cancel
    Find this American trip Look for PSA 5654 + Republic 3509 on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)82%

    351 flights · 86% on time as flown · 2.9% cancel

  • PSA Airlines (sold as American Eagle)76%

    152 flights · 82% on time as flown · 3.5% cancel

  • American Airlines72%

    54 flights · 78% on time as flown · 5.2% cancel

  • Envoy Air (sold as American Eagle)69%

    743 flights · 71% on time as flown · 3.3% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)67%

    465 flights · 71% on time as flown · 4.7% cancel

On time by departure time

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

  • Before 9 AM81%

    522 flights · avg delay 13 min

  • 9 AM to noon85%

    553 flights · avg delay 13 min

  • Noon to 3 PM83%

    76 flights · avg delay 20 min

  • 3 to 6 PM58%

    351 flights · avg delay 31 min

  • 6 to 9 PM59%

    259 flights · avg delay 29 min

Best day: Tuesday (83%). Worst: Friday (76%).

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