20 providers offer 242 broadband deals in Cardiff, from £20 a month (£40 after 12 months) and up to 7,000 Mbps. Typical measured speed is 131 Mbps down and 23 Mbps up, 30% above the UK download average. Full fibre is available to 92.4% of homes.
Deals for Cardiff, checked and refreshed daily.
Best value broadband deal in Cardiff
The best value in Cardiff on full first-year cost is 4th Utility's 900Mb Full Fibre (24 Months): £264 across year one, about £22 a month. At 900 Mbps it copes with anything a household runs at once.
Best value in Cardiff
£22/mo
for 12 months, then £44/mo
Cheapest broadband deal in Cardiff
The cheapest deal in Cardiff is 300Mb Full Fibre (24 Months) from 4th Utility at £20.00 a month for 300 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. The £20.00 is an intro price that rises to £40.00 a month after the intro window, making the real first-year cost £240. YouFibre is essentially level at £20.00 a month.
Cheapest in Cardiff
£20/mo
for 12 months, then £40/mo
Runner-up on price
£20/mo
No rises, no surprises.
Fastest broadband deal in Cardiff
The fastest deal available in 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 Cardiff
£50/mo
No rises, no surprises.
Runner-up on speed
Gig2 Fibre broadband + Netflix
£51.99/mo
rises to £55.99 in April 2027 (+£4)
Compare broadband deals in Cardiff
£22.99/mo
rises to £26.99 in March 2027 (+£4)
£23/mo
No rises, no surprises.
£25.99/mo
rises to £29.99 in March 2027 (+£4)
£23.99/mo
rises to £27.99 in March 2027 (+£4)
Broadband providers in Cardiff
20 providers serve Cardiff including Virgin Media, Sky and BT, 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 Cardiff download speed at 131 Mbps.
Upgrade nudge
Room to upgrade in Cardiff
Only 19% of the 107,000 connections here are on 300Mbps or faster, even though 92% 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 Cardiff line runs 131 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 92% of Cardiff, and the fastest available is 1,000 Mbps. The full split by band is below.
What broadband coverage does Cardiff have?
Superfast broadband reaches 97% of Cardiff premises and gigabit 92%, on Ofcom's premise-level data.
Can I rely on mobile broadband in Cardiff?
Outdoor 5G reaches 100% of Cardiff homes. Here is how mobile holds up if the line drops.
The two 5G figures differ. “5G availability” is everyday 5G running on the existing 4G core, which is what most phones show. “Next-gen 5G” is standalone 5G: a full 5G network with lower lag, still reaching fewer places.
5G & 4G home broadband
Outdoor 5G covers 100% of Cardiff, enough for a 5G home-broadband hub to stand in for a fixed line.
Broadband speeds by Cardiff neighbourhood
Measured speeds range from 164 Mbps in Plasnewydd to 91 Mbps in Pentyrch and St Fagans, so your street matters more than the Cardiff average.
| Neighbourhood | Median | vs area | Upload | Superfast | Gigabit | 5G |
|---|---|---|---|---|---|---|
| Plasnewydd CF24 | 164 | +33 | 24 | 99% | 95% | 100% |
| Grangetown CF11 | 135 | +4 | 24 | 98% | 90% | 100% |
| Whitchurch and Tongwynlais CF14 | 134 | +3 | 25 | 99% | 94% | 100% |
| Fairwater CF5 | 126 | -5 | 21 | 99% | 93% | 100% |
| Trowbridge CF3 | 123 | -8 | 20 | 99% | 94% | 100% |
| Butetown CF10 | 116 | -15 | 21 | 82% | 72% | 100% |
| Penylan CF23 | 112 | -19 | 21 | 98% | 94% | 100% |
| Pentyrch and St Fagans CF15 | 91 | -40 | 18 | 97% | 81% | 100% |
Measured Ofcom data per Cardiff neighbourhood, ranked fastest first. Median and upload are in Mbps; vs area is the median difference from the Cardiff average; superfast, gigabit and 5G are the % of premises covered. Swipe the table sideways for more columns.
Postcode districts in Cardiff
Towns in Cardiff
Nearby areas
Frequently asked questions
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Speed and coverage figures for 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.