ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe 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 → BWI
Greenville/Greer/Spartanburg to Baltimore: 719 nonstop flights a year
On time (12 months)
89%
Cancelled
1.5%
avg delay 8 min
Best time to leave
9 AM to noon
100% on time vs 69% 3 to 6 PM
Most reliable airline
Southwest
87% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Best trips
4 nonstop, 16 with 1 connection. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.
Best overall#1 · Nonstop · 1h 30m
8:00 AM → 9:30 AM
92%
arrive on time
93% on time · 1.3% cancel8:00 AM GSP → 9:30 AM BWI1h 30m
Southwest 3412
Boeing 737-700 · 16–23 yrs oldFind Southwest 3412 fares Opens this date on Aviasales#2 · Nonstop · 1h 35m
12:25 PM → 2:00 PM
90%
arrive on time
91% on time · 1.5% cancel12:25 PM GSP → 2:00 PM BWI1h 35m
Southwest 643
Boeing 737-700 · 17–23 yrs oldFind Southwest 643 fares Opens this date on Aviasales#3 · Nonstop · 1h 35m
8:10 AM → 9:45 AM
90%
arrive on time
91% on time · 1.1% cancel8:10 AM GSP → 9:45 AM BWI1h 35m
Southwest 2243
Boeing 737-700 · 17–23 yrs oldFind Southwest 2243 fares Opens this date on Aviasales#4 · Nonstop · 1h 30m
1:50 PM → 3:20 PM
89%
arrive on time
90% on time · 1.0% cancel1:50 PM GSP → 3:20 PM BWI1h 30m
Southwest 2244 · also flew as 3029
Boeing 737-700 · 9–23 yrs oldFind Southwest 2244 fares Opens this date on Aviasales#5 · 1 connection · 4h 05m · one ticket (American)
5:21 AM → 9:26 AM
95%
connections made
80%
arrive on time
96% on time · 1.3% cancel5:21 AM GSP → 6:25 AM CLT1h 04m
PSA 5381 · sold as American Eagle
Bombardier CRJ900 · 7–12 yrs oldConnect in CLT · 1h 35m · 98% chance to make it · same ticket: the airline rebooks you if you miss it85% on time · 1.7% cancel8:00 AM CLT → 9:26 AM BWI1h 26m
American 1635
Airbus A319 · 13–27 yrs oldFind this American trip Look for PSA 5381 + American 1635 on Aviasales#6 · 1 connection · 3h 39m · one ticket (American)
5:21 AM → 9:00 AM
92%
connections made
78%
arrive on time
96% on time · 1.3% cancel5:21 AM GSP → 6:25 AM CLT1h 04m
PSA 5381 · sold as American Eagle
Bombardier CRJ900 · 7–12 yrs oldConnect in CLT · 1h 05m · 95% chance to make it · same ticket: the airline rebooks you if you miss it85% on time · 1.3% cancel7:30 AM CLT → 9:00 AM BWI1h 30m
American 1929
Boeing 737-800 · 9–27 yrs oldFind this American trip Look for PSA 5381 + American 1929 on Aviasales#7 · 1 connection · 3h 40m · one ticket (American)
5:20 AM → 9:00 AM
91%
connections made
77%
arrive on time
95% on time · 2.0% cancel5:20 AM GSP → 6:16 AM CLT56m
American 1490
Airbus A319 · 20–27 yrs oldConnect in CLT · 1h 14m · 94% chance to make it · same ticket: the airline rebooks you if you miss it85% on time · 1.3% cancel7:30 AM CLT → 9:00 AM BWI1h 30m
American 1929
Boeing 737-800 · 9–27 yrs oldFind this American trip Look for American 1490 + American 1929 on Aviasales#8 · 1 connection · 4h 06m · one ticket (American)
5:20 AM → 9:26 AM
92%
connections made
78%
arrive on time
95% on time · 2.0% cancel5:20 AM GSP → 6:16 AM CLT56m
American 1490
Airbus A319 · 20–27 yrs oldConnect in CLT · 1h 44m · 96% chance to make it · same ticket: the airline rebooks you if you miss it85% on time · 1.7% cancel8:00 AM CLT → 9:26 AM BWI1h 26m
American 1635
Airbus A319 · 13–27 yrs oldFind this American trip Look for American 1490 + American 1635 on Aviasales#9 · 1 connection · 4h 29m · separate tickets
5:21 AM → 9:50 AM
95%
connections made
84%
arrive on time
96% on time · 1.3% cancel5:21 AM GSP → 6:25 AM CLT1h 04m
PSA 5381 · sold as American Eagle
Bombardier CRJ900 · 7–12 yrs oldConnect in CLT · 1h 55m · 97% chance to make it · separate tickets: collect and re-check bags, re-clear security; if you miss it the second airline does not have to rebook you89% on time · 1.4% cancel8:20 AM CLT → 9:50 AM BWI1h 30m
Southwest 351
Boeing 737-700 · 17–23 yrs oldFlight 1: find PSA 5381 (GSP–CLT) Flight 2: find Southwest 351 (CLT–BWI) Book each flight separately on Aviasales#10 · 1 connection · 4h 35m · one ticket (American)
7:00 AM → 11:35 AM
90%
connections made
76%
arrive on time
89% on time · 1.9% cancel7:00 AM GSP → 8:12 AM CLT1h 12m
PSA 5654 · sold as American Eagle · also flew as 5434, 5589
Bombardier CRJ900 · 9–12 yrs oldConnect in CLT · 1h 57m · 94% chance to make it · same ticket: the airline rebooks you if you miss it85% on time · 2.7% cancel10:09 AM CLT → 11:35 AM BWI1h 26m
American 2316
Airbus A319 · 13–27 yrs oldFind this American trip Look for PSA 5654 + American 2316 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.
- Southwest Airlines87%
719 flights · 89% on time as flown · 1.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM96%
319 flights · avg delay 3 min
- 9 AM to noon100%
46 flights · avg delay 0 min
- Noon to 3 PM92%
140 flights · avg delay 6 min
- 3 to 6 PM69%
125 flights · avg delay 22 min
- 6 to 9 PM80%
89 flights · avg delay 16 min
Best day: Wednesday (89%). Worst: Monday (80%).
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