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Quantum Fiber vs Xfinity in Salt Lake City
Salt Lake City shoppers must choose between Quantum Fiber’s faster symmetrical speeds where available and Xfinity’s wider coverage and lower starting price.
Xfinity is the better overall pick because it reaches about 98% of Salt Lake City, starts at $40/mo, and offers strong download speeds, while Quantum Fiber reaches about 58% and starts at $50/mo. Quantum Fiber wins on speed and upload performance if it reaches your address; Xfinity wins on coverage and starting price. Quantum Fiber’s 95/100 speed score suits heavy uploaders, gamers, and large households, while Xfinity’s 86/100 score and wider availability make it the easier choice for most shoppers.
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% | $50/mo | Solid fiber option |
| 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
The better choice can shift by ZIP code and neighborhood because coverage varies block to block in Salt Lake City. Quantum Fiber reaches about 58% of the city overall, while Xfinity reaches about 98%, so check your exact address before deciding.
| ZIP | Neighborhoods | Coverage | Top speed | Rank 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 | 47 | 72 | Xfinity |
| 84118 | Kearns, Taylorsville, West Valley City | 40% | 99% | 8 Gig | 2 Gig | 38 | 75 | Xfinity |
| 84106 | Sugar House, Millcreek, Liberty Wells, East Liberty Park | 87% | 100% | 8 Gig | 2 Gig | 83 | 76 | Quantum Fiber |
| 84109 | Millcreek, Canyon Rim, Olympus Cove, Wasatch Hollow | 88% | 97% | 3 Gig | 2 Gig | 84 | 73 | Quantum Fiber |
| 84129 | Taylorsville, Kearns, West Valley City | 18% | 100% | 8 Gig | 2 Gig | 17 | 76 | Xfinity |
| 84123 | Taylorsville, Murray, Millcreek | 45% | 100% | 8 Gig | 2 Gig | 43 | 76 | Xfinity |
| 84104 | Poplar Grove, Glendale, Fairpark, Euclid | 59% | 99% | 8 Gig | 2 Gig | 56 | 75 | Xfinity |
| 84115 | South Salt Lake, Central Pointe, Ballpark | 62% | 100% | 8 Gig | 2 Gig | 59 | 76 | Xfinity |
| 84116 | Rose Park, Fairpark, Westpointe, North Salt Lake border | 42% | 98% | 8 Gig | 2 Gig | 39 | 75 | Xfinity |
| 84107 | Murray, Union, Cottonwood | 45% | 99% | 8 Gig | 2 Gig | 42 | 75 | Xfinity |
| 84105 | Sugar House, Yalecrest, East Bench, Wasatch Hollow | 93% | 100% | 2 Gig | 2 Gig | 89 | 76 | Quantum Fiber |
| 84117 | Holladay, Millcreek, Cottonwood | 74% | 100% | 8 Gig | 2 Gig | 71 | 76 | Xfinity |
| 84124 | Holladay, Cottonwood Heights, Mount Olympus | 82% | 99% | 8 Gig | 2 Gig | 78 | 75 | Quantum Fiber |
| 84108 | Bonneville Hills, Federal Heights, Research Park, St. Mary’s | 76% | 95% | 2 Gig | 2 Gig | 72 | 72 | Xfinity |
| 84102 | The Avenues, University of Utah area, East Central, Gilmer Park | 65% | 100% | 2 Gig | 2 Gig | 62 | 76 | Xfinity |
| 84103 | The Avenues, Capitol Hill, Marmalade District, Federal Heights | 38% | 98% | 8 Gig | 2 Gig | 36 | 74 | Xfinity |
| 84111 | Downtown, Central City, Central Ninth, East Downtown | 36% | 99% | 2 Gig | 2 Gig | 34 | 75 | Xfinity |
| 84101 | Downtown, Gateway District, Rio Grande, Central City | 21% | 98% | 2 Gig | 2 Gig | 20 | 75 | Xfinity |
| 84126 | Salt Lake City (PO Box/general) | 25% | 94% | 8 Gig | 2 Gig | 24 | 71 | Xfinity |
| 84127 | Salt Lake City (administrative/unique ZIP) | 25% | 94% | 8 Gig | 2 Gig | 24 | 71 | Xfinity |
| 84125 | Salt Lake City (PO Box/general) | 25% | 94% | 8 Gig | 2 Gig | 24 | 71 | Xfinity |
| 84112 | University of Utah | 29% | 86% | 2 Gig | 2 Gig | 27 | 65 | Xfinity |
| 84152 | Salt Lake City (PO Box ZIP) | 80% | 100% | 2 Gig | 2 Gig | 76 | 76 | Xfinity |
| 84165 | Salt Lake City (PO Box ZIP) | 15% | 98% | 2 Gig | 2 Gig | 14 | 74 | Xfinity |
| 84171 | Salt Lake City (PO Box ZIP) | 51% | 100% | 2 Gig | 2 Gig | 48 | 76 | Xfinity |
| 84170 | Salt Lake City (PO Box ZIP) | 52% | 100% | 8 Gig | 2 Gig | 49 | 76 | Xfinity |
Rank score (0–100) is each provider’s Speed Score, discounted for weak upload, times the share of that ZIP it reaches — the same rule that orders providers on the Salt Lake City city page, 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
- 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 Salt Lake City address?
Quantum Fiber reaches about 58% of Salt Lake City overall, while Xfinity reaches about 98%. Coverage varies block to block, so enter your exact address to confirm which service is available.
Which is cheaper, Quantum Fiber or Xfinity, and what will I actually pay?
Xfinity starts at $40/mo, compared with $50/mo for Quantum Fiber. Those are promotional starting rates, so confirm the post-promo rate, equipment fees, and any contract before signing; then choose based on the full cost at your address.
Which is faster for gaming, working from home, and 4K streaming?
Quantum Fiber reaches up to 8,000/8,000 Mbps where available, while Xfinity reaches up to 2,000/300 Mbps where available. Quantum Fiber is the stronger performance choice if it reaches your address, but check availability and the specific plan before signing up.
More Salt Lake City comparisons
How Salt Lake City’s other qualifying providers stack up head-to-head.