Colorado / Denver / Quantum Fiber vs Xfinity

Quantum Fiber vs Xfinity in Denver

Quantum Fiber offers cheaper, symmetrical multi-gig speeds in Denver, but Xfinity reaches far more homes, so the real question is whether fiber is on your block.

The 30-Second VerdictUpdated August 7, 2026

Quantum Fiber wins on raw value: symmetrical speeds up to 8,000 Mbps and a $30 starting price beat Xfinity’s cable plan on paper, and its 99/100 speed score edges out Xfinity’s 95/100. But Quantum Fiber only reaches about 70% of Denver, while Xfinity covers roughly 98% of the city. Quantum Fiber is the pick for anyone who can get it and wants top speed for less. Xfinity is the safe default when fiber hasn’t reached your block yet.

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	70%	$30/mo	Top fiber speeds
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.

View

Showing the provider with the faster available plan in each ZIP. Click any ZIP for the breakdown.

Neighborhood breakdown

Coverage varies block to block in Denver, so the winner can flip on the same street. In neighborhoods where Quantum Fiber’s ~70% footprint reaches, it’s usually the better buy; in the remaining areas, Xfinity’s ~98% coverage often makes it the only real choice. Always check both at your exact address before deciding.

ZIP	Neighborhoods	Coverage		Top speed		Speed Score		Winner
ZIP	Neighborhoods	Quantum Fiber	Xfinity	Quantum Fiber	Xfinity	Quantum Fiber	Xfinity	Winner
80220	Hale, Montclair, Mayfair, East Colfax	79%	100%	8 Gig	2 Gig	95	96	Xfinity
80219	Westwood, Barnum, Mar Lee, Athmar Park	93%	100%	2 Gig	2 Gig	98	96	Quantum Fiber
80216	Globeville, Elyria-Swansea, River North (RiNo)	61%	94%	8 Gig	2 Gig	91	95	Xfinity
80204	Lincoln Park, Sun Valley, Villa Park, West Colfax	69%	98%	8 Gig	2 Gig	93	96	Xfinity
80214	Edgewater, West Colfax, Lakewood (Eiber)	87%	100%	8 Gig	2 Gig	97	96	Quantum Fiber
80210	University, Observatory Park, University Park, Rosedale	90%	100%	8 Gig	2 Gig	97	96	Quantum Fiber
80205	Five Points, Cole, Whittier, Clayton	65%	99%	8 Gig	2 Gig	92	96	Xfinity
80226	Lakewood, Belmar, Eiber	79%	100%	8 Gig	2 Gig	95	96	Xfinity
80212	West Highland, Berkeley, Regis	95%	100%	8 Gig	2 Gig	98	96	Quantum Fiber
80221	Federal Heights, Sherrelwood, Westminster (south), Berkeley	78%	98%	8 Gig	2 Gig	95	96	Xfinity
80211	Highlands, Sunnyside, Sloan’s Lake, LoHi (Lower Highlands)	85%	100%	8 Gig	2 Gig	96	96	Xfinity
80207	Park Hill, North Park Hill, Northeast Park Hill	82%	98%	8 Gig	2 Gig	96	96	Xfinity
80232	Lakewood, Meadowlark Hills, Green Gables	61%	100%	8 Gig	2 Gig	91	96	Xfinity
80239	Montbello, Green Valley Ranch, Gateway	70%	100%	8 Gig	2 Gig	93	96	Xfinity
80222	Virginia Village, University Hills, Goldsmith	83%	100%	8 Gig	2 Gig	96	96	Xfinity
80233	Thornton, Northglenn	52%	99%	8 Gig	2 Gig	90	96	Xfinity
80206	Cheesman Park, Congress Park, City Park West, Cherry Creek North	77%	99%	2 Gig	2 Gig	95	96	Xfinity
80246	Glendale, Belcaro, Virginia Village	60%	100%	8 Gig	2 Gig	91	96	Xfinity
80223	Athmar Park, Ruby Hill, Baker, Overland	70%	95%	8 Gig	2 Gig	93	95	Xfinity
80238	Central Park, Stapleton, Northfield	40%	98%	8 Gig	2 Gig	87	96	Xfinity
80228	Green Mountain, Union Square, Lakewood	46%	98%	8 Gig	2 Gig	88	96	Xfinity
80229	Thornton, Northglenn, Welby	39%	98%	8 Gig	2 Gig	87	96	Xfinity
80234	Northglenn, Thornton	5%	99%	8 Gig	2 Gig	80	96	Xfinity
80227	Bear Valley, Green Mountain, Lakewood	37%	97%	8 Gig	2 Gig	87	95	Xfinity
80260	Northglenn, Sherrelwood, Welby	12%	100%	8 Gig	2 Gig	82	96	Xfinity
80249	Green Valley Ranch, Gateway, First Creek	40%	100%	8 Gig	2 Gig	87	96	Xfinity
80209	Washington Park, Baker, Country Club, Platt Park	83%	99%	2 Gig	2 Gig	96	96	Xfinity
80215	Applewood, Lakewood, Rooney Valley	80%	99%	2 Gig	2 Gig	95	96	Xfinity
80203	Capitol Hill, Civic Center, North Capitol Hill, Golden Triangle	63%	100%	8 Gig	2 Gig	92	96	Xfinity
80236	Harvey Park, Fort Logan, Bear Valley	72%	99%	8 Gig	2 Gig	94	96	Xfinity
80202	LoDo (Lower Downtown), Union Station, Central Business District, Ballpark	26%	95%	8 Gig	2 Gig	84	95	Xfinity
80231	Hampden, Cherry Creek Vista, Windsor	27%	100%	8 Gig	2 Gig	85	96	Xfinity
80224	Virginia Village, Goldsmith, Washington Virginia Vale	68%	99%	8 Gig	2 Gig	93	96	Xfinity
80218	Capitol Hill, Cheesman Park, City Park West, Country Club	71%	100%	8 Gig	2 Gig	93	96	Xfinity
80230	Lowry, Lowry Field	17%	100%	8 Gig	2 Gig	83	96	Xfinity
80237	Hampden, Southmoor Park, DTC (Denver Tech Center)	33%	100%	8 Gig	2 Gig	86	96	Xfinity
80247	Windsor, Aurora, Hampden	20%	98%	8 Gig	2 Gig	83	96	Xfinity
80235	Bear Valley, Pinehurst, Fort Logan	21%	98%	8 Gig	2 Gig	83	96	Xfinity
80217	Downtown Denver, Central Denver	78%	98%	2 Gig	2 Gig	95	96	Xfinity
80248	Downtown Denver	33%	100%	2 Gig	2 Gig	86	96	Xfinity
80201	Downtown Denver, Central Business District	33%	100%	2 Gig	2 Gig	86	96	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.

Gaming

Quantum Fiber

Its fiber connection and 99/100 speed score edge out Xfinity’s 95/100, and symmetrical uploads help with streaming your gameplay, where available.

Streaming

Xfinity

Up to 2,000 Mbps down easily handles multiple 4K streams, and with ~98% coverage you’re far more likely to actually get it at your address.

Video calls

Quantum Fiber

Symmetrical uploads up to 8,000 Mbps beat Xfinity’s 300 Mbps upload cap, keeping your camera sharp on busy calls, where available.

Just the basics

Quantum Fiber

At $30/mo it’s the cheaper starting price, and even its entry-level fiber is plenty for browsing, email, and a couple of streams.

Get connected

Pick your provider and check availability at your address.

Check plans

Top speed8 Gig

Upload8 Gig

Coverage70%

From$30/mo

8 Gig down · 8 Gig up Fiber
2 Gig down · 1 Gig up Fiber
1 Gig down · 1 Gig up Fiber

Check plans

Top speed2 Gig

Upload300 Mbps

Coverage98%

From$40/mo

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.

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Frequently asked questions

is quantum fiber available at my address in denver?

Quantum Fiber reaches about 70% of Denver, while Xfinity covers roughly 98%, so there’s a real chance fiber hasn’t hit your block yet. Enter your exact address on both providers’ sites to confirm availability before you plan around either one.

which is cheaper in denver, quantum fiber or xfinity?

Quantum Fiber starts at $30/mo versus Xfinity’s $40/mo, making fiber the cheaper starting price. Note these are promotional starting rates, so confirm the post-promo price, equipment fees, and any contract terms with each provider before you sign.

is quantum fiber fast enough for gaming, working from home, and 4k?

Yes, Quantum Fiber offers symmetrical speeds up to 8,000 Mbps with a 99/100 speed score, easily covering gaming, WFH uploads, and 4K, where available. Xfinity’s 2,000/300 Mbps and 95/100 score also handle all three; if you can get fiber, go for it, otherwise Xfinity is more than enough.

How we compare. Coverage is the share of a ZIP where a provider offers a genuinely good plan (≥ 1 Gbps download, ≥ 20 Mbps upload, non-satellite), from FCC Broadband Map serviceability data. “Fastest available” ranks the providers present in a ZIP by top advertised download speed. Pricing reflects current promotional starting rates. This is a working prototype; production copy is generated per matchup.