United Airlines operates flight UA4257 between Dulles (IAD) and Knoxville/Maryville (TYS). This route is typically operated by an ERJ-145XR. Based on United Airlines' current Starlink rollout — 525 of 1,787 aircraft equipped (29% of the fleet) — we estimate a 0% probability that this specific flight is equipped with Starlink satellite WiFi.
No route-specific aircraft evidence needed: E45X is an operator-wide claim covering every E45X aircraft in the fleet (0.0%).
Equipped
Fleet Size
Coverage
Rollout in progress — confirmed install count pending
Score is based on United Airlines's fleet-wide coverage: 525 of 1787 aircraft are Starlink-equipped (29% 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. United 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 IAD→TYS updates.
United Airlines has announced Starlink but has not yet equipped any aircraft. We'll update this page as installations are confirmed.
UA4257 is used on more than one route, and the aircraft assigned isn't always the same. The score above reflects the best-equipped version, so your flight may differ.
Aircraft recently seen operating this flight
| Date | Tail Number | Route |
|---|---|---|
| Feb 22, 2026 | N21154 | IAD → TYS |
Check the Starlink probability on other United Airlines routes.
We estimate a 0% probability that flight UA4257 has Starlink WiFi. No route-specific aircraft evidence needed: E45X is an operator-wide claim covering every E45X aircraft in the fleet (0.0%). United Airlines is actively rolling out Starlink across its fleet. Check back as our data updates when new aircraft are confirmed.
United Airlines uses Starlink satellite WiFi on equipped aircraft. Flight UA4257 operates IAD to TYS. Our Starlink probability score for this flight is 0%, based on United 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 United Airlines app may show the aircraft registration. You can then search that tail number on StarlinkFlights.com. Alternatively, our probability score for flight UA4257 is 0% based on current fleet data.
The prediction for UA4257 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: E45X is an operator-wide claim covering every E45X 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.
