Route on-time record
STL to LGA: most on-time flights and the best time to fly
St Louis (St. Louis Lambert International Airport) to New York (LaGuardia Airport). 2,660 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 4.1% were cancelled. The most reliable flight number was Southwest 4477 at 5:50 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
STL → LGA
St Louis to New York: 2,660 nonstop flights a year
On time (12 months)
75%
Cancelled
4.1%
avg delay 18 min
Best time to leave
Before 9 AM
90% on time vs 59% 6 to 9 PM
Most reliable airline
Republic
76% chance on time
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 · Southwest 4477
5:50 AM → 9:10 AM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 98%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 98% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 59%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 4477 fares Opens this date on Aviasales#2 · Republic 4669 · sold as American Eagle, Delta Connection or United Express
6:00 AM → 9:29 AM2h 29m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.7%
- Avg arrival delay
- 5 min
- Arrived on time 93% of the time (136 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 59%).
Moderate track record · 136 flights
Find 6:00 AM flight fares Opens this date on Aviasales#3 · Republic 4368 · sold as American Eagle, Delta Connection or United Express
6:35 AM → 10:09 AM2h 34m nonstop
Local times, typical schedule. Last flown 2026-05-20.
88%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 94% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 59%).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find 6:35 AM flight fares Opens this date on Aviasales#4 · Republic 5673 · sold as American Eagle, Delta Connection or United Express
6:10 AM → 9:34 AM2h 24m nonstop
Local times, typical schedule. Last flown 2026-05-06.
86%
chance on time
- On time (history)
- 91%
- Cancelled
- 7.8%
- Avg arrival delay
- 9 min
- Arrived on time 91% of the time (46 flights, Jun 2025 to May 2026).
- Cancelled 7.8% of the time (4 of 51).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 59%).
- Short track record (46 flights), so its score leans on the airline's record at this hour.
Limited track record · 46 flights
Find 6:10 AM flight fares Opens this date on Aviasales#5 · Southwest 343
5:40 AM → 9:00 AM2h 20m nonstop
Local times, typical schedule. Last flown 2026-04-06.
83%
chance on time
- On time (history)
- 95%
- Cancelled
- 17.9%
- Avg arrival delay
- 2 min
- Arrived on time 95% of the time (22 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 59%).
- Short track record (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find Southwest 343 fares Opens this date on Aviasales#6 · Republic 4486 · sold as American Eagle, Delta Connection or United Express
7:05 AM → 10:33 AM2h 28m nonstop
Local times, typical schedule. Last flown 2026-04-06.
80%
chance on time
- On time (history)
- 82%
- Cancelled
- 4.7%
- Avg arrival delay
- 17 min
- Arrived on time 82% of the time (141 flights, Jun 2025 to May 2026).
- Cancelled 4.7% of the time (7 of 148).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 59%).
Moderate track record · 141 flights
Find 7:05 AM flight fares Opens this date on Aviasales#7 · Republic 4521 · sold as American Eagle, Delta Connection or United Express
3:42 PM → 7:19 PM2h 37m nonstop
Local times, typical schedule. Last flown 2026-05-19.
77%
chance on time
- On time (history)
- 84%
- Cancelled
- 3.0%
- Avg arrival delay
- 12 min
- Arrived on time 84% of the time (32 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- 77% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find 3:42 PM flight fares Opens this date on Aviasales#8 · Republic 4524 · sold as American Eagle, Delta Connection or United Express
11:25 AM → 3:00 PM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-20.
77%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 82% of the time (44 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Lands inside LGA's trouble window: 54% of its 285 ground stops and delay programs started between noon and 6 PM.
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 44 flights
Find 11:25 AM flight fares Opens this date on Aviasales#9 · Republic 5613 · sold as American Eagle, Delta Connection or United Express
12:45 PM → 4:15 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-05-06.
73%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 75% of the time (24 flights, Jun 2025 to May 2026).
- Lands inside LGA's trouble window: 54% of its 285 ground stops and delay programs started between noon and 6 PM.
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find 12:45 PM flight fares Opens this date on Aviasales#10 · Southwest 3881
10:30 AM → 1:50 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-04-06.
72%
chance on time
- On time (history)
- 67%
- Cancelled
- 10.7%
- Avg arrival delay
- 10 min
- Arrived on time 67% of the time (24 flights, Jun 2025 to May 2026).
- Lands inside LGA's trouble window: 54% of its 285 ground stops and delay programs started between noon and 6 PM.
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find Southwest 3881 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)76%
1,246 flights · 80% on time as flown · 4.9% cancel
- Southwest Airlines68%
1,386 flights · 70% on time as flown · 3.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
758 flights · avg delay 8 min
- 9 AM to noon77%
585 flights · avg delay 16 min
- Noon to 3 PM69%
379 flights · avg delay 22 min
- 3 to 6 PM66%
476 flights · avg delay 26 min
- 6 to 9 PM59%
462 flights · avg delay 27 min
Best day: Wednesday (84%). Worst: Friday (79%).
Smarter routing
Nearby airports that run more on time
STL → EWR 77% chance on time
St. Louis Lambert International Airport to Newark Liberty International Airport · 1,060 flights a year · 17 mi from your airports · yours: 72%
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 volume34%
- Airline (crew, maintenance, boarding)27%
- Severe weather4%
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
STL to LGA questions
- What time of day is best to fly STL to LGA?
- Before 9 AM: 90% of flights arrived on time, against 59% 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 STL to LGA?
- Republic, with a season-adjusted 76% chance of operating and arriving on time over 1,246 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 STL to LGA?
- July (71% 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.
More routes from STL
- LGA to STL (return)
- STL to ATL 85%
- STL to DEN 75%
- STL to ORD 71%
- STL to MCO 78%
- STL to DCA 73%
- STL to DFW 74%
- STL to PHX 76%
- STL to LAS 79%
- STL to DAL 77%
- STL to DTW 83%
- STL to MSP 80%
- STL to CLT 83%
Live status: FAA delays and ground stops