Carrier route record
YXSTL→LGA
Republic Airways · St. Louis to New York
- Flights
- 1,227
- Period
- July 2025 to June 2026
- Share of route
- 46%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on STL to LGA carries a cancellation problem, not just a delay problem: 4.6% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, about four flights in five arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,227 flights, with a median arrival 11 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on STL to LGA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.3%
Arrivals under 15 minutes late, of 1,165 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
4.56%
National rate is 1.81%
Whole route
74.9%
Every carrier on STL to LGA, 2,645 flights
These figures cover 1,227 flights between July 2025 and June 2026. Beyond the headline rate, 10.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Republic against every carrier on STL to LGA
Republic flew 1,227 of the 2,645 flights on STL to LGA, about 46% of it. Its 80.3% on time is 5 points better than the route as a whole, which runs 74.9%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 80.3% to SkyWest at 66.7%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways (this page) | 1,227 | 80.3% | 85 min | 4.56% | B− |
| Southwest Airlines | 1,390 | 70.4% | 57 min | 3.17% | C− |
| SkyWest Airlinesthin sample | 28 | 66.7% | 78 min | 0.00% | C+ |
Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 16 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am392 flights86.8%
- 8am–11am155 flights89.4%
- 11am–2pm326 flights73.7%
- 2pm–5pm289 flights74.6%
- 5pm–8pm65 flights74.6%
- 8pm–5am—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 73.7% on time against 89.4% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 5am–8am window is the busiest, with 392 flights scheduled in it.
Across the year
Republic on STL to LGA through the year
September is the best month on the calendar at 91.7% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 138 flights.
Across the week, Wednesday is the strongest day at 84.7% on time and Friday the weakest at 76.8%. 8 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Republic runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 20,000 reported delay minutes.
- 36%Late-arriving aircraft
- 33%National Airspace System
- 27%Carrier
- 4%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 20,000 reported delay minutes here, that single category outweighs weather by 9 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 19,648 reported delay minutes.
33% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 6,523 minutes out of 20,000, against a national NAS share of 21%.
Cancellations run at 4.56%, against 1.81% nationally. That is roughly one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 888 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 77.6% on time across 1,226 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,227 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking Republic on STL to LGA
Put together: the delay figures matter less here than the 4.56% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,165 completed flights over 12 months sit behind that.
Related
Where to go next
- STL to LGA, every carrier
- Republic on LGA to STL, the return leg
- Southwest Airlines on STL to LGA70.4%
- Republic Airways network-wide record
- St. Louis Lambert International (STL) delay statistics
- LaGuardia (LGA) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.