Southwest Airlines operates flight WN4559 between Sacramento (SMF) and Phoenix (PHX). This route is typically operated by a B737. Based on Southwest Airlines' current Starlink rollout — 8 of 817 aircraft equipped (1% of the fleet) — we estimate a 0% probability that this specific flight is equipped with Starlink satellite WiFi.
No route-specific aircraft evidence needed: B737 is an operator-wide claim covering every B737 aircraft in the fleet (0.0%).
Equipped
Fleet Size
Coverage
Score is based on Southwest Airlines's fleet-wide coverage: 8 of 817 aircraft are Starlink-equipped (1% fleet ratio). No aircraft-type-specific rollout data is recorded for this route, so the score reflects the fleet-wide average.
Starlink coverage on this route is limited. Southwest Airlines has started its Starlink rollout, but this route or aircraft type may not yet be equipped — the probability will rise as more aircraft are confirmed.
No spam. One email when coverage on SMF→PHX updates.
Prediction (0%) reflects the chance this specific flight has Starlink. No route-specific aircraft evidence needed: B737 is an operator-wide claim covering every B737 aircraft in the fleet (0.0%). B737 coverage (0%) shows how many B737 aircraft have Starlink.
WN4559 is used on more than one route. The score above reflects the best-equipped version, so your flight may differ.
Aircraft recently seen operating this flight
| Date | Tail Number | Route |
|---|---|---|
| Mar 5, 2026 | N8969S | MKE → LAS |
Check the Starlink probability on other Southwest Airlines routes.
We estimate a 0% probability that flight WN4559 has Starlink WiFi. No route-specific aircraft evidence needed: B737 is an operator-wide claim covering every B737 aircraft in the fleet (0.0%). Southwest Airlines is actively rolling out Starlink across its fleet. Check back as our data updates when new aircraft are confirmed.
Southwest Airlines uses Starlink satellite WiFi on equipped aircraft. Flight WN4559 operates SMF to PHX. Our Starlink probability score for this flight is 0%, based on Southwest Airlines' fleet rollout data and confirmed tail numbers.
The most reliable method is to check your specific tail number after check-in — your boarding pass or the Southwest Airlines app may show the aircraft registration. You can then search that tail number on StarlinkFlights.com. Alternatively, our probability score for flight WN4559 is 0% based on current fleet data.
The prediction for WN4559 is based on the aircraft actually observed or claimed to operate this route, not a generic fleet-wide guess. No route-specific aircraft evidence needed: B737 is an operator-wide claim covering every B737 aircraft in the fleet (0.0%). A confirmed, dated passenger sighting for this specific flight can override this when one exists.
No prediction can guarantee a specific aircraft. Airlines perform last-minute equipment swaps for maintenance, operational needs, or schedule changes — meaning a Starlink-equipped tail can be replaced by a non-equipped one on the day. A score of 80% or above means historical data strongly favours Starlink on this flight, but it is not a guarantee. For the most reliable information, check the airline's gate display or app on the day of departure.
