WN4421Southwest Airlines · DEN → BOI
live · 31m ago
Route confirmed Southwest Airlines

WN4421 DenverDEN · 20:20 BoiseBOI · 22:20

WN4421 by Southwest Airlines flies from Denver (DEN) to Boise (BOI) for the Tue, Nov 3 departure.

Right nowEn route to Boise · off blocks 20:22 · 2 min late
En route

en route from DEN to BOI

En routeWN4421 · position estimated
DENDenverBOIBoise
Estimated from the boards

Board estimate · gate and arrival times. Off blocks 20:22 · typical taxi-out at DEN ≈ 7.3 min.

⚖ WN4421 typically leaves +13 and lands −5. The air wins minutes back.
Typical gate push+13 minmedian posted departure
Typical arrival−5 minmedian over 11 operations
Wins back in air~18 minmedian gate push vs arrival · how planes make up time → Cancellation0 in 11tracked operations · cancellation odds calculator →

Where the minutes go

last 7 operations · gate push → arrival
0+30+60+90 min
11-03
+2 gate · −10 arrival
10-30
+11 gate · −5 arrival
10-29
+12 gate · −6 arrival
10-28
+18 gate · +6 arrival
10-27
+2 gate · −10 arrival
10-26
+44 gate · +29 arrival
10-25
+13 gate · −13 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 −5 min · 0 cancelled · 11 operations tracked

The route today

live boards
DENDenverOn-time likelyDEN delay board →
BOIBoiseOn-time likelyBOI delay board →
DEN→BOIevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
46%Chance of 15+ min delay
1.3%Chance of cancellation
+11 minTypical airport delay in this weather

Conditions at DEN and BOI 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 Denver

Forecast

Wed 4 Nov, local date

High13°Clikely 11°C to 15°C
Low1°Clikely 0°C to 3°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 Boise

Forecast

Wed 4 Nov, local date

High14°Clikely 12°C to 15°C
Low4°Clikely 2°C to 5°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 Denver to Boise flights today

same route · Southwest Airlines
WN2954departs 08:05
WN3872departs 08:35
WN2178departs 08:40
WN114departs 08:45
WN2107departs 08:50
WN336departs 12:50

If WN4421 is cancelled, these are the other Southwest Airlines nonstop flights from Denver to Boise on the same day, with scheduled departure times in DEN 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 WN4421 actually runs

Pro Flight Search has tracked every published board update for WN4421 across the DEN and BOI boards: schedule changes, gate pushes and actual clocks. Usually lands ~6 min late. Based on 11 confirmed landings · 6/11 within 15 min of schedule.

The verdict above is that record speaking, so it reflects how WN4421 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
11-03DEN 20:20 20:22 (+2)BOI 22:20 22:10 (−10)
10-30DEN 20:55 21:06 (+11)BOI 23:00 22:55 (−5)
10-29DEN 20:55 21:07 (+12)BOI 23:00 22:54 (−6)
10-28DEN 20:20 20:38 (+18)BOI 22:20 22:26 (+6)
10-27DEN 20:20 20:22 (+2)BOI 22:20 22:10 (−10)
10-26DEN 20:55 21:39 (+44)BOI 23:00 23:29 (+29)
10-25DEN 21:00 21:13 (+13)BOI 23:05 22:52 (−13)
10-24DEN 19:35 19:45 (+10)BOI 21:50 21:19 (−31)
10-23DEN 20:55 22:28 (+93)BOI 23:00 00:07 (+67)
10-22DEN 20:55 23:20 (+145)BOI 23:00 00:53 (+113)
10-21DEN BOI 22:20 22:45 (+25)

Aircraft

Recent tails: N8843S, N8881L, N8853Q, N8763L.

Board clocks recorded as DEN and BOI published them.

Planning around WN4421? 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: WN4421 Denver to Boise on-time performance, measured from the DEN and BOI airport boards.

Canonical URL
https://proflightsearch.com/flight/WN4421
How we measure this →