19 providers offer 218 broadband deals in Pentyrch and St Fagans, from £15.00 a month and up to 1,600 Mbps. Typical measured speed is 91 Mbps down and 18 Mbps up, 10% below the UK download average.
Best value broadband deal in Pentyrch and St Fagans, Cardiff (CF15)
The best value in Pentyrch and St Fagans, Cardiff (CF15) 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 Pentyrch and St Fagans, Cardiff (CF15)
£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 Pentyrch and St Fagans, Cardiff (CF15)
The fastest deal available in Pentyrch and St Fagans, Cardiff (CF15) is Full Fibre 1.6GB Premium from EE at 1,600 Mbps.
Fastest in Pentyrch and St Fagans, Cardiff (CF15)
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
Cheapest broadband deal in Pentyrch and St Fagans, Cardiff (CF15)
The cheapest deal in Pentyrch and St Fagans, Cardiff (CF15) 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 Pentyrch and St Fagans, Cardiff (CF15)
£5/mo
for 6 months, then £25/mo
Avg £20/mo over contract · £480 total over 24 months
Compare broadband deals in Pentyrch and St Fagans, Cardiff (CF15)
£5/mo
for 6 months, then £28/mo
Avg £22.25/mo over contract · £534 total over 24 months
Gig1 Broadband Only
41 Mbps upload · Hybrid Fibre-Coaxial
Best for power users & big households
£25.99/mo
rises to £29.99 in April 2027 (+£4)
Avg £28.99/mo over contract · £696 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 Pentyrch and St Fagans, Cardiff (CF15)
19 providers serve Pentyrch and St Fagans, Cardiff (CF15), with EE the fastest at 1,600 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 Pentyrch and St Fagans, Cardiff (CF15) download speed at 91 Mbps.
Upgrade nudge
Room to upgrade in Pentyrch and St Fagans, Cardiff (CF15)
Only 9% of the 5,600 connections here are on 300Mbps or faster, even though 81% can get gigabit.
The faster line is already there. For most of these homes it is the contract holding them back, not the infrastructure.
Is your broadband good enough?
The typical Pentyrch and St Fagans, Cardiff (CF15) line runs 91 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 81% of Pentyrch and St Fagans, Cardiff (CF15), and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Pentyrch and St Fagans, Cardiff (CF15)?
The wholesale networks carrying Pentyrch and St Fagans, Cardiff (CF15) broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
These are the alternatives to Openreach in Pentyrch and St Fagans, Cardiff (CF15): smaller infrastructure firms that have laid their own fibre. The pricing pressure they create is good news on a Saturday morning bill review.
- CityFibre: Sky, The One Broadband, Vodafone
- 4th Utility: 4th Utility, Rise Fibre
On top of the altnets, Openreach and Virgin Media O2 also serve Pentyrch and St Fagans, Cardiff (CF15) (Openreach is everywhere in the UK by default).
There are 19 providers on the live deal list for Pentyrch and St Fagans, Cardiff (CF15).
What broadband coverage does Pentyrch and St Fagans, Cardiff (CF15) have?
Superfast broadband reaches 97% of Pentyrch and St Fagans, Cardiff (CF15) premises but gigabit only 81%, so around 16% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Pentyrch and St Fagans, Cardiff (CF15)?
Outdoor 5G reaches 100% of Pentyrch and St Fagans, Cardiff (CF15) homes. Here is how mobile holds up if the line drops.
5G & 4G home broadband
Outdoor 5G covers 100% of Pentyrch and St Fagans, Cardiff (CF15), enough for a 5G home-broadband hub to stand in for a fixed line.
How Pentyrch and St Fagans, Cardiff (CF15) compares within Cardiff
Across 8 postcode districts in Cardiff, by premises count, typical speed and gigabit coverage.
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 Pentyrch and St Fagans, Cardiff (CF15)come 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.