DL4939Delta Air Lines · LGA → STL
live · 44m ago
Route confirmed Delta Air Lines

DL4939 New YorkLGA · 06:45 St LouisSTL · 08:29

DL4939 by Delta Air Lines flies from New York (LGA) to St Louis (STL).

Right nowNext departure today Operates daily
06:45

scheduled from LGA

⚖ DL4939 typically leaves −8 and lands −30. The air wins minutes back.
Typical gate push−8 minmedian posted departure
Typical arrival−30 minmedian over 10 operations
Wins back in air~22 minmedian gate push vs arrival · how planes make up time → Cancellation0 in 10tracked operations · cancellation odds calculator →

Where the minutes go

last 7 operations · gate push → arrival
0+30+60+90 min
11-06
−4 gate · +14 arrival
11-05
−7 gate · −15 arrival
11-04
−12 gate · −31 arrival
11-03
−8 gate · −11 arrival
11-02
−6 gate · −34 arrival
10-30
−11 gate · −29 arrival
10-29
−10 gate · −38 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The last 30 days

arrival outcome per operation

median arrival −30 min · 0 cancelled · 10 operations tracked

The route today

live boards
LGANew YorkOn-time likelyLGA delay board →
STLSt LouisOn-time likelySTL delay board →
LGA→STLevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
38%Chance of 15+ min delay
2.3%Chance of cancellation
+7 minTypical airport delay in this weather

Conditions at LGA and STL are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow at New York

Forecast

Mon 9 Nov, local date

High15°Clikely 13°C to 18°C
Low11°Clikely 8°C to 13°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at St Louis

Forecast

Mon 9 Nov, local date

High18°Clikely 15°C to 21°C
Low4°Clikely 3°C to 7°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other New York to St Louis flights today

same route · Delta Air Lines
DL4922departs 09:59
DL5607departs 13:50
DL4905departs 15:05
DL4926departs 18:25

If DL4939 is cancelled, these are the other Delta Air Lines nonstop flights from New York to St Louis on the same day, with scheduled departure times in LGA local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How DL4939 actually runs

Pro Flight Search has tracked every published board update for DL4939 across the LGA and STL boards: schedule changes, gate pushes and actual clocks. Usually lands ~21 min early. Based on 10 confirmed landings · 9/10 within 15 min of schedule. Pushes back late but makes up time in the air.

The verdict above is that record speaking, so it reflects how DL4939 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
11-06LGA 06:45 06:41 (−4)STL 08:29 08:43 (+14)
11-05LGA 06:45 06:38 (−7)STL 08:29 08:14 (−15)
11-04LGA 06:45 06:33 (−12)STL 08:29 07:58 (−31)
11-03LGA 06:45 06:37 (−8)STL 08:29 08:18 (−11)
11-02LGA 06:45 06:39 (−6)STL 08:29 07:55 (−34)
10-30LGA 06:45 06:34 (−11)STL 08:29 08:00 (−29)
10-29LGA 06:45 06:35 (−10)STL 08:29 07:51 (−38)
10-28LGA 06:45 06:28 (−17)STL 08:29 07:52 (−37)
10-27LGA 06:45 06:37 (−8)STL 08:29 08:24 (−5)
10-26LGA 06:45 06:36 (−9)STL 08:29 07:53 (−36)

Aircraft

Recent tails: N349PQ, N182GJ, N348PQ, N906XJ.

Board clocks recorded as LGA and STL published them.

Planning around DL4939? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: DL4939 New York to St Louis on-time performance, measured from the LGA and STL airport boards.

Canonical URL
https://proflightsearch.com/flight/DL4939
How we measure this →