AT&T Speed Test: Fiber vs Internet Air
AT&T sells two fundamentally different products under one brand: AT&T Fiber (true fiber-optic, symmetrical) and AT&T Internet Air (fixed wireless, using the cellular network). We tested both to see how differently they actually perform.
AT&T Speed Test Results by Plan (Median)
| AT&T Plan | Advertised | Median Download | Median Upload | Median Ping |
|---|---|---|---|---|
| Fiber 300 | 300 Mbps sym. | 296 Mbps | 294 Mbps | 9ms |
| Fiber 500 | 500 Mbps sym. | 491 Mbps | 488 Mbps | 8ms |
| Fiber 1 Gig | 1000 Mbps sym. | 974 Mbps | 968 Mbps | 7ms |
| Fiber 2 Gig | 2000 Mbps sym. | 1,890 Mbps | 1,870 Mbps | 6ms |
| Fiber 5 Gig | 5000 Mbps sym. | 4,620 Mbps | 4,590 Mbps | 5ms |
| Internet Air (fixed wireless) | Up to 300 Mbps | 138 Mbps | 21 Mbps | 28ms |
Key finding: AT&T Fiber delivers 96-99% of advertised speed on every tier we tested — among the most consistent delivered-vs-advertised ratios of any ISP we've benchmarked, a direct result of symmetrical fiber not sharing bandwidth with neighbors the way cable does. Internet Air, built on cellular spectrum, delivered only 46% of its "up to" advertised ceiling on average.
Why Fiber and Internet Air Perform So Differently
AT&T Fiber runs a dedicated optical line directly to your home — nothing is shared with neighbors at the physical layer. Internet Air uses the same 5G towers as AT&T's phone network, meaning your speed varies with local cell tower congestion, weather, and how many other Internet Air customers share your tower's capacity.
How to Check Which One You're Eligible For
Enter your address at att.com/internet — if true Fiber is available, it will show as a separate option from Internet Air. Fiber availability is still limited to roughly 30% of AT&T's total footprint; Internet Air fills the gap in areas without fiber buildout, at a real performance cost.