22 providers offer 244 broadband deals in St Fagans, from £15.00 a month and up to 7,000 Mbps. Typical measured speed is 58 Mbps down and 14 Mbps up, 43% below the UK download average.
Best value broadband deal in St Fagans, Cardiff
The best value in St Fagans, Cardiff on full first-year cost is Plusnet's Full Fibre 145: £292 across year one, about £24 a month. A £155 reward card is bundled in. 145 Mbps covers streaming, video calls and working from home.
Best value in St Fagans, Cardiff
£22.99/mo
rises to £26.99 in March 2027 (+£4)
Avg £26.32/mo over contract · £632 total over 24 months
Fastest broadband deal in St Fagans, Cardiff
The fastest deal available in St Fagans, Cardiff is You 8000 from YouFibre at 7,000 Mbps. Next fastest is Gig2 Fibre broadband + Netflix from Virgin Media O2 at 2,000 Mbps.
Fastest in St Fagans, Cardiff
£99/mo
No rises, no surprises.
£1188 total over 12 months
Runner-up on speed
Gig2 Fibre broadband + Netflix
200 Mbps upload · Hybrid Fibre-Coaxial
Best for power users & big households
£51.99/mo
rises to £55.99 in April 2027 (+£4)
Avg £54.99/mo over contract · £1320 total over 24 months
Cheapest broadband deal in St Fagans, Cardiff
The cheapest deal in St Fagans, Cardiff is Fast 24m from giffgaff at £5.00 a month for 200 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. The £5.00 is an intro price that rises to £25.00 a month after the intro window, making the real first-year cost £180. Comfortably faster than the UK average.
Cheapest in St Fagans, Cardiff
£5/mo
for 6 months, then £25/mo
Avg £20/mo over contract · £480 total over 24 months
Compare broadband deals in St Fagans, Cardiff
£5/mo
for 6 months, then £28/mo
Avg £22.25/mo over contract · £534 total over 24 months
Full Fibre 1.6GB Premium
115 Mbps upload · Full Fibre
Best for power users & big households
£33.99/mo
rises to £37.99 in March 2027 (+£4)
Avg £37.32/mo over contract · £896 total over 24 months
Sky Full Fibre Gigafast
100 Mbps upload · Full Fibre
Best for power users & big households
£31/mo
No rises, no surprises.
£749 total over 24 months
Onestream Fibre 55
10 Mbps upload · Hybrid Fibre
Best for small homes, single 4K streamer
£19.94/mo
rises to £22.69 in April 2027 (+£2.75)
Avg £22/mo over contract · £528 total over 24 months
Broadband providers in St Fagans, Cardiff
22 providers serve St Fagans, Cardiff, with YouFibre the fastest at 7,000 Mbps.
Ranked by Ofcom complaints per 100,000 customers, fewest first. A down arrow is below the industry average, up is above, and a dash means Ofcom publishes no figure for that provider (usually because it is below Ofcom's 1.5% market-share reporting threshold). A small diagonal arrow shows the past-year trend (↘ improving, ↗ getting worse).
Ofcom records the typical St Fagans, Cardiff download speed at 58 Mbps.
Upgrade nudge
You could be getting more.
Prices drift above the market rate the longer a contract runs, so if you have not compared in over a year you are likely paying more than you need to.
Is your broadband good enough?
The typical St Fagans, Cardiff line runs 58 Mbps.
Working from home
OKStreaming and family use
OKWhat speeds are people actually getting?
Gigabit reaches 33% of St Fagans, Cardiff, and the fastest available is 152 Mbps. The full split by band is below.
Which broadband networks reach St Fagans, Cardiff?
The wholesale networks carrying St Fagans, Cardiff broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Real altnet coverage in St Fagans, Cardiff, not the press release version. The list comes from who is actually selling deals at addresses here, network by network.
- CityFibre: Sky, The One Broadband, Vodafone
- Hyperoptic
- 4th Utility: 4th Utility, Rise Fibre
Of the major networks, Openreach and Virgin Media O2 are also live here (Openreach is on every street, so the interesting variable is the altnets).
Today's live count in St Fagans, Cardiff: 22 providers on the page.
What broadband coverage does St Fagans, Cardiff have?
Superfast broadband reaches 99% of St Fagans, Cardiff premises but gigabit only 33%, so around 66% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in St Fagans, Cardiff?
Outdoor 5G reaches 100% of St Fagans, Cardiff homes. Here is how mobile holds up if the line drops.
5G & 4G home broadband
Outdoor 5G covers 100% of St Fagans, Cardiff, enough for a 5G home-broadband hub to stand in for a fixed line.
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Nearby areas
Frequently asked questions
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* Based on Go.Compare research estimating that 28% of UK broadband users pay for faster broadband speeds than they need (which we interpret as overpaying), equivalent to around 7.5m UK households.
Speed and coverage figures for St Fagans, Cardiffcome from Ofcom's Connected Nations data, current to January 2026. Deal prices are pulled live from providers. Compiled by the FindBroadband team. See how we rank and source our data.