17 providers offer 184 broadband deals in Castlewellan, from £19.99 a month and up to 1,600 Mbps. Typical measured speed is 75 Mbps down and 17 Mbps up, 26% below the UK download average.
Best value broadband deal in Castlewellan, Newry, Mourne and Down (BT31)
The best value in Castlewellan, Newry, Mourne and Down (BT31) 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 Castlewellan, Newry, Mourne and Down (BT31)
£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 Castlewellan, Newry, Mourne and Down (BT31)
The fastest deal available in Castlewellan, Newry, Mourne and Down (BT31) is Full Fibre 1.6GB Premium from EE at 1,600 Mbps.
Fastest in Castlewellan, Newry, Mourne and Down (BT31)
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 Castlewellan, Newry, Mourne and Down (BT31)
The cheapest deal in Castlewellan, Newry, Mourne and Down (BT31) is Full Fibre 150 from Fibrus at £19.99 a month for 159 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. 4th Utility is essentially level at £20.00 a month. Comfortably faster than the UK average.
Cheapest in Castlewellan, Newry, Mourne and Down (BT31)
£19.99/mo
No rises, no surprises.
£360 total over 18 months
Runner-up on price
300Mb Full Fibre (24 Months)
300 Mbps upload · Full Fibre
Best for 4–5 person households, heavy use
£20/mo
for 12 months, then £40/mo
Avg £30/mo over contract · £720 total over 24 months
Compare broadband deals in Castlewellan, Newry, Mourne and Down (BT31)
300Mb Full Fibre (24 Months)
300 Mbps upload · Full Fibre
Best for 4–5 person households, heavy use
£20/mo
for 12 months, then £40/mo
Avg £30/mo over contract · £720 total over 24 months
£30/mo
rises to £33.50 in April 2027 (+£3.50)
Avg £32.63/mo over contract · £783 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 Castlewellan, Newry, Mourne and Down (BT31)
17 providers serve Castlewellan, Newry, Mourne and Down (BT31), 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 Castlewellan, Newry, Mourne and Down (BT31) download speed at 75 Mbps.
Upgrade nudge
Room to upgrade in Castlewellan, Newry, Mourne and Down (BT31)
Only 12% of the 2,000 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 Castlewellan, Newry, Mourne and Down (BT31) line runs 75 Mbps.
Working from home
OKStreaming and family use
OKWhat speeds are people actually getting?
Gigabit reaches 92% of Castlewellan, Newry, Mourne and Down (BT31), and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Castlewellan, Newry, Mourne and Down (BT31)?
The wholesale networks carrying Castlewellan, Newry, Mourne and Down (BT31) broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Full-fibre altnets that have rolled out in Castlewellan, Newry, Mourne and Down (BT31). They don't reach every address, but where they do, the gigabit pricing is normally sharper than the Openreach equivalent.
- CityFibre: Sky, The One Broadband
- 4th Utility: 4th Utility, Rise Fibre
Then there's Openreach (Openreach is laid to virtually every UK address).
Today's live count in Castlewellan, Newry, Mourne and Down (BT31): 17 providers on the page.
What broadband coverage does Castlewellan, Newry, Mourne and Down (BT31) have?
Superfast broadband reaches 98% of Castlewellan, Newry, Mourne and Down (BT31) premises but gigabit only 92%, so around 6% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Castlewellan, Newry, Mourne and Down (BT31)?
Outdoor 5G reaches 98% of Castlewellan, Newry, Mourne and Down (BT31), but 4% of homes get no indoor 4G from any network, so a mobile backup here wants a window.
How Castlewellan, Newry, Mourne and Down (BT31) compares within Newry, Mourne and Down
Across 6 postcode districts in Newry, Mourne and Down, 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 Castlewellan, Newry, Mourne and Down (BT31)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.