United Airlines operates flight UA558 between Denver (DEN) and Boston (BOS). This route is typically operated by a 737-900. Based on United Airlines' current Starlink rollout — 665 of 1,575 aircraft equipped (42% of the fleet) — our Starlink rating for this specific flight is very likely.
Based on how many 737-900 aircraft at United Airlines have Starlink.
Starlink was measured by a passenger speed test on aircraft N14521 on Jul 13, 2026. That aircraft flew this flight on Oct 3, 2026.
Equipped
Fleet Size
Coverage
Source: United's Starlink tracker, as of Oct 29, 2026
44 aircraft independently verified
Based on how many 737-900 aircraft at United Airlines have Starlink. Starlink was measured by a passenger speed test on aircraft N14521 on Jul 13, 2026. That aircraft flew this flight on Oct 3, 2026.
Very likely means the evidence strongly favors Starlink on this flight. It is not a guarantee, because airlines swap aircraft on the day.
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Rating: Very likely. This is our rating that this specific flight has Starlink. Based on how many 737-900 aircraft at United Airlines have Starlink. Starlink was measured by a passenger speed test on aircraft N14521 on Jul 13, 2026. That aircraft flew this flight on Oct 3, 2026.
Check the Starlink rating on other United Airlines routes.
Our Starlink rating for flight UA558 is very likely. Based on how many 737-900 aircraft at United Airlines have Starlink. Starlink was measured by a passenger speed test on aircraft N14521 on Jul 13, 2026. That aircraft flew this flight on Oct 3, 2026. 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 UA558 operates DEN to BOS. Our Starlink rating for this flight is very likely, 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 rating for flight UA558 is very likely, based on current fleet data.
The prediction for UA558 is based on the aircraft actually observed or claimed to operate this route, not a generic fleet-wide guess. Based on how many 737-900 aircraft at United Airlines have Starlink. Starlink was measured by a passenger speed test on aircraft N14521 on Jul 13, 2026. That aircraft flew this flight on Oct 3, 2026. 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 rating of very likely means historical data strongly favors 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.
