vs
Quantum Fiber vs Xfinity in Salt Lake City
In Salt Lake City the choice is Quantum Fiber’s cheaper, faster symmetrical fiber against Xfinity’s near-citywide cable that reaches roughly 98% of homes.
Quantum Fiber wins on raw value: symmetrical speeds up to 8,000 Mbps for $30/mo and a 97/100 speed score make it the better pick where its fiber actually reaches. The catch is coverage—Quantum Fiber passes roughly 58% of Salt Lake City, while Xfinity blankets about 98% and still hits up to 2,000 Mbps down. If you can get Quantum Fiber, take it for the price and upload speed. If not, Xfinity is the reliable, near-universal fallback that covers most homes.
At a glance
Quantum Fiber vs. Xfinity, side by side.
| Provider | Type | Top speed | City coverage | Starting price | Best for |
|---|---|---|---|---|---|
| Quantum Fiber |
Fiber | 8 Gig 8 Gig upload |
58% | $30/mo | Budget-friendly |
| Xfinity |
Cable | 2 Gig 300 Mbps upload |
98% | $40/mo | Widest availability |
Coverage map
Two different questions, two views. Top speed shows who offers the faster plan where you can actually get it. Coverage shows who reaches more of each ZIP. Or pick a single provider to see just its footprint.
Neighborhood breakdown
Coverage varies block to block in Salt Lake City, so the winner can flip by street. Xfinity’s cable reaches roughly 98% of the city and is likely available almost everywhere, while Quantum Fiber’s ~58% footprint means fiber is present in many neighborhoods but not all. Always check both at your exact address before deciding.
| ZIP | Neighborhoods | Coverage | Top speed | Speed Score | Winner | |||
|---|---|---|---|---|---|---|---|---|
| Quantum Fiber | Xfinity | Quantum Fiber | Xfinity | Quantum Fiber | Xfinity | |||
| 84121 | Cottonwood Heights, Willow Creek, Big Cottonwood Canyon, Sandy | 49% | 95% | 8 Gig | 2 Gig | 87 | 92 | Xfinity |
| 84118 | Kearns, Taylorsville, West Valley City | 40% | 99% | 8 Gig | 2 Gig | 86 | 93 | Xfinity |
| 84106 | Sugar House, Millcreek, Liberty Wells, East Liberty Park | 87% | 100% | 8 Gig | 2 Gig | 95 | 93 | Quantum Fiber |
| 84109 | Millcreek, Canyon Rim, Olympus Cove, Wasatch Hollow | 88% | 97% | 3 Gig | 2 Gig | 95 | 92 | Quantum Fiber |
| 84129 | Taylorsville, Kearns, West Valley City | 18% | 100% | 8 Gig | 2 Gig | 81 | 93 | Xfinity |
| 84123 | Taylorsville, Murray, Millcreek | 45% | 100% | 8 Gig | 2 Gig | 87 | 93 | Xfinity |
| 84104 | Poplar Grove, Glendale, Fairpark, Euclid | 59% | 99% | 8 Gig | 2 Gig | 89 | 93 | Xfinity |
| 84115 | South Salt Lake, Central Pointe, Ballpark | 62% | 100% | 8 Gig | 2 Gig | 90 | 93 | Xfinity |
| 84116 | Rose Park, Fairpark, Westpointe, North Salt Lake border | 42% | 98% | 8 Gig | 2 Gig | 86 | 92 | Xfinity |
| 84107 | Murray, Union, Cottonwood | 45% | 99% | 8 Gig | 2 Gig | 87 | 93 | Xfinity |
| 84105 | Sugar House, Yalecrest, East Bench, Wasatch Hollow | 93% | 100% | 2 Gig | 2 Gig | 96 | 93 | Quantum Fiber |
| 84117 | Holladay, Millcreek, Cottonwood | 74% | 100% | 8 Gig | 2 Gig | 92 | 93 | Xfinity |
| 84124 | Holladay, Cottonwood Heights, Mount Olympus | 82% | 99% | 8 Gig | 2 Gig | 94 | 93 | Quantum Fiber |
| 84108 | Bonneville Hills, Federal Heights, Research Park, St. Mary’s | 76% | 95% | 2 Gig | 2 Gig | 93 | 92 | Quantum Fiber |
| 84102 | The Avenues, University of Utah area, East Central, Gilmer Park | 65% | 100% | 2 Gig | 2 Gig | 91 | 93 | Xfinity |
| 84103 | The Avenues, Capitol Hill, Marmalade District, Federal Heights | 38% | 98% | 8 Gig | 2 Gig | 85 | 92 | Xfinity |
| 84111 | Downtown, Central City, Central Ninth, East Downtown | 36% | 99% | 2 Gig | 2 Gig | 85 | 93 | Xfinity |
| 84101 | Downtown, Gateway District, Rio Grande, Central City | 21% | 98% | 2 Gig | 2 Gig | 82 | 92 | Xfinity |
| 84126 | Salt Lake City (PO Box/general) | 25% | 94% | 8 Gig | 2 Gig | 83 | 92 | Xfinity |
| 84127 | Salt Lake City (administrative/unique ZIP) | 25% | 94% | 8 Gig | 2 Gig | 83 | 92 | Xfinity |
| 84125 | Salt Lake City (PO Box/general) | 25% | 94% | 8 Gig | 2 Gig | 83 | 92 | Xfinity |
| 84112 | University of Utah | 29% | 86% | 2 Gig | 2 Gig | 83 | 90 | Xfinity |
| 84152 | Salt Lake City (PO Box ZIP) | 80% | 100% | 2 Gig | 2 Gig | 94 | 93 | Quantum Fiber |
| 84165 | Salt Lake City (PO Box ZIP) | 15% | 98% | 2 Gig | 2 Gig | 81 | 92 | Xfinity |
| 84171 | Salt Lake City (PO Box ZIP) | 51% | 100% | 2 Gig | 2 Gig | 88 | 93 | Xfinity |
| 84170 | Salt Lake City (PO Box ZIP) | 52% | 100% | 8 Gig | 2 Gig | 88 | 93 | Xfinity |
Speed Score (0–100) blends each provider’s coverage and top speed in that specific ZIP, so it moves as availability changes street to street.
Which is better for…
The right pick comes down to what you actually do online.
Get connected
Pick your provider and check availability at your address.
- 8 Gig down · 8 Gig up Fiber
- 3 Gig down · 3 Gig up Fiber
- 2 Gig down · 1 Gig up Fiber
- 2 Gig down · 300 Mbps up Cable
- 2 Gig down · 300 Mbps up Fiber
- 1 Gig down · 35 Mbps up Cable
See what’s actually available at your address
Coverage changes from one street to the next. Check your exact address in seconds.
Check my addressFrequently asked questions
is quantum fiber available at my address in salt lake city?
Quantum Fiber covers roughly 58% of Salt Lake City, versus about 98% for Xfinity, so fiber reaches many but not all homes. Enter your exact street address on both providers’ sites to confirm which is live before you plan around it.
which is cheaper in salt lake city, quantum fiber or xfinity?
Quantum Fiber starts at $30/mo versus $40/mo for Xfinity, making it the cheaper headline price. Note these are promotional starting rates, so confirm the post-promo rate, equipment fees, and any contract terms before you sign.
is quantum fiber fast enough for gaming, working from home, and 4k?
Yes—Quantum Fiber reaches up to 8,000/8,000 Mbps with a 97/100 speed score, while Xfinity hits up to 2,000/300 Mbps at 91/100, and both clear 4K and WFH needs. If uploads matter for calls or streaming, pick Quantum Fiber’s symmetrical fiber where available; otherwise Xfinity’s speeds are still plenty.
More Salt Lake City comparisons
How Salt Lake City’s other qualifying providers stack up head-to-head.