Route on-time record

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

Greenville/Greer/Spartanburg (Greenville-Spartanburg International Airport) to Chicago (Chicago O'Hare International Airport). 1,766 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 3.7% were cancelled. The most reliable flight number was Republic 3439 at 6:30 AM.

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

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.

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 · Republic 3439 · sold as American Eagle, Delta Connection or United Express
6:30 AM → 7:54 AM2h 24m nonstop
Local times, typical schedule. Last flown 2026-04-29.
85%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
10 min
- Arrived on time 88% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find 6:30 AM flight fares Opens this date on Aviasales
#2 · SkyWest 5930 · sold as United Express, Delta Connection, American Eagle or Alaska
6:30 AM → 7:53 AM2h 23m nonstop
Local times, typical schedule. Last flown 2026-03-28.
81%
chance on time
On time (history)
89%
Cancelled
6.6%
Avg arrival delay
6 min
- Arrived on time 89% of the time (71 flights, Jun 2025 to May 2026).
- Cancelled 6.6% of the time (5 of 76).
Moderate track record · 71 flights
Find 6:30 AM flight fares Opens this date on Aviasales
#3 · SkyWest 5312 · sold as United Express, Delta Connection, American Eagle or Alaska
10:40 AM → 11:57 AM2h 17m nonstop
Local times, typical schedule. Last flown 2026-05-20.
80%
chance on time
On time (history)
95%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 95% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 85% on time; 3 to 6 PM: 58%).
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find 10:40 AM flight fares Opens this date on Aviasales
#4 · Envoy 3676 · sold as American Eagle
7:20 AM → 8:47 AM2h 27m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
On time (history)
100%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 100% of the time (9 flights, Jun 2025 to May 2026).
- Short track record (9 flights), so its score leans on the airline's record at this hour.
Limited track record · 9 flights
Find 7:20 AM flight fares Opens this date on Aviasales
#5 · Envoy 3603 · sold as American Eagle
7:30 AM → 8:56 AM2h 26m nonstop
Local times, typical schedule. Last flown 2026-05-20.
76%
chance on time
On time (history)
78%
Cancelled
3.5%
Avg arrival delay
12 min
- Arrived on time 78% of the time (167 flights, Jun 2025 to May 2026).
- Cancelled 3.5% of the time (6 of 173).
Moderate track record · 167 flights
Find 7:30 AM flight fares Opens this date on Aviasales
#6 · SkyWest 5620 · sold as United Express, Delta Connection, American Eagle or Alaska
6:36 AM → 8:00 AM2h 24m nonstop
Local times, typical schedule. Last flown 2026-05-20.
75%
chance on time
On time (history)
84%
Cancelled
5.0%
Avg arrival delay
29 min
- Arrived on time 84% of the time (19 flights, Jun 2025 to May 2026).
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find 6:36 AM flight fares Opens this date on Aviasales
#7 · Envoy 3556 · sold as American Eagle
11:34 AM → 12:48 PM2h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Envoy 3918; its record covers all of them.
75%
chance on time
On time (history)
77%
Cancelled
0.6%
Avg arrival delay
23 min
- Arrived on time 77% of the time (154 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 85% on time; 3 to 6 PM: 58%).
Moderate track record · 154 flights
Find 11:34 AM flight fares Opens this date on Aviasales
#8 · American 1401
7:40 AM → 8:56 AM2h 16m nonstop
Local times, typical schedule. Last flown 2026-04-06.
73%
chance on time
On time (history)
77%
Cancelled
9.4%
Avg arrival delay
14 min
- Arrived on time 77% of the time (48 flights, Jun 2025 to May 2026).
- Cancelled 9.4% of the time (5 of 53).
- Short track record (48 flights), so its score leans on the airline's record at this hour.
Limited track record · 48 flights
Find American 1401 fares Opens this date on Aviasales
#9 · SkyWest 5361 · sold as United Express, Delta Connection, American Eagle or Alaska
10:46 AM → 12:00 PM2h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
On time (history)
70%
Cancelled
0.0%
Avg arrival delay
9 min
- Arrived on time 70% of the time (10 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 85% on time; 3 to 6 PM: 58%).
- Short track record (10 flights), so its score leans on the airline's record at this hour.
Limited track record · 10 flights
Find 10:46 AM flight fares Opens this date on Aviasales
#10 · Envoy 4242 · sold as American Eagle
8:16 PM → 9:36 PM2h 22m nonstop
Local times, typical schedule. Last flown 2026-05-20.
66%
chance on time
On time (history)
71%
Cancelled
9.6%
Avg arrival delay
22 min
- Arrived on time 71% of the time (121 flights, Jun 2025 to May 2026).
- Cancelled 9.6% of the time (13 of 136).
- 52% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 121 flights
Find 8:16 PM flight fares Opens this date on Aviasales

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%).

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.

What delays this route

Late-arriving aircraft35%
Air traffic control and airport volume30%
Airline (crew, maintenance, boarding)27%
Severe weather8%

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

GSP to ORD questions

What time of day is best to fly GSP to ORD?: 9 AM to noon: 85% of flights arrived on time, against 58% for departures 3 to 6 PM.
Which airline is most on time from GSP to ORD?: Republic, with a season-adjusted 82% chance of operating and arriving on time over 351 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 GSP to ORD?: July (68% on time); the best was September (87%), 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.

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