| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Sep 18 | STL | PHX | 20:45 | 22:00 |
Delayed
|
Track > |
| Sep 17 | STL | PHX | 22:56 | 23:43 |
Delayed
|
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| Sep 16 | STL | PHX | 21:27 | 22:11 |
Landed
|
Track > |
| Sep 15 | STL | PHX | 21:33 | 22:20 |
Landed Late
|
Track > |
| Sep 14 | STL | PHX | 22:09 | 22:59 |
Delayed
|
Track > |
| Sep 13 | STL | PHX | 21:56 | 22:42 |
Landed
|
Track > |
| Sep 11 | STL | PHX | 21:12 | 21:58 |
Landed
|
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| Sep 10 | STL | PHX | 21:19 | 21:58 |
Landed
|
Track > |
| Sep 09 | STL | PHX | 20:59 | 21:53 |
Landed
|
Track > |
| Sep 08 | STL | PHX | 21:03 | 21:41 |
Landed
|
Track > |
Southwest Airlines Flight WN3878 connects St. Louis, United States to Phoenix, United States, taking off from St. Louis Lambert International Airport STL and landing at Phoenix Sky Harbor International Airport PHX.
How long is the WN3878 flight from St. Louis to Phoenix?
The average flight time from St. Louis to Phoenix is 2 hours and 45 minutes. The flight distance is 2027 km / 1259 miles and the average flight speed is 723 km/h / 450 mph.
How many WN3878 flights are operated per week?
6 flights per week. The flight WN3878 is operated on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday.
What is the On-Time Performance (OTP) of Southwest Airlines Flight WN3878 St. Louis to Phoenix?
The Airportia On-Time Performance Rating for Southwest Airlines Flight WN3878 is 4.7/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight WN3878 arriving at?
Flight WN3878 arrives at Phoenix Sky Harbor International Airport (PHX) Terminal 4.
When was the latest WN3878 flight?
The latest flight took off on Saturday, September 19th, 2026 with the flight status being Scheduled on 22:00.
How else can the flight WN3878 be referenced as?
This Southwest Airlines flight can also be referenced as SWA3878, WN 3878, SWA 3878.
How often is flight WN3878 delayed?
On average, 50% of all WN3878 flights are delayed. The average delay is 41 minutes.
Can I get compensation for my delayed or cancelled WN3878 flight or baggage issues?
If your WN3878 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.
See our WN3878 Flight Tracker above for more details.
Other flights departing from St. Louis STL: WN1638, WN3955, WN4166, WN5412
Other flights arriving at Phoenix PHX: AS632, AA2942, WN2248, WN787
All flights connecting St. Louis STL to Phoenix PHX.