BT vs Three broadband: prices compared
Three is cheaper than BT on each provider's cheapest plan: Three 5G Home Broadband, 24 month at £20.79 a month averaged over its 24-month contract (advertised at £17.00) against BT Full Fibre 150 at £31.66 a month averaged over its 24-month contract (advertised at £26.99), read from each provider's own page on 2026-11-11 and 2026-11-15.
7 BT plans and 2 Three plans are ranked together below on what the contract costs a month, with each provider's published rises counted. Speeds differ between the plans, so the rows show each one's own.
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See where it is and which of these prices a stated area limit leaves out.
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The plans behind it
UK broadband · read from each provider's own page on 2026-11-15, with the page linked on each row.
£20.79 a month over 24 monthsadvertised at £17.00 · then £20.50 from 1 April 2027, then £24.00 from 1 April 2028 · up to 150 Mbps (average download speed)unlimited data on their 5G network; no landline and no engineer; the price includes a £5 recurring-payment discountGo to Three- £24.04 a month over 12 monthsadvertised at £22.00 · then £25.50 from 1 April 2027 · up to 150 Mbps (average download speed)unlimited data on their 5G network; the price includes a £5 recurring-payment discountGo to Three
£31.66 a month over 24 monthsadvertised at £26.99 · then £30.99 from March 2027, then £34.99 from March 2028 · up to 150 Mbps (plan speed) · an offer price, no end date stated · nothing to pay upfront"£0 activation fee"Go to BT- £31.66 a month over 24 monthsadvertised at £26.99 · then £30.99 from 31 March 2027, then £34.99 from 31 March 2028 · up to 35/8 Mbps (estimated speed) · nothing to pay upfronttheir page: "35-36Mbps download speed", "8 - 9Mbps upload"; "Free activation"; 32 Mbps speed guaranteeGo to BT
- £32.66 a month over 24 monthsadvertised at £27.99 · then £31.99 from 31 March 2027, then £35.99 from 31 March 2028 · up to 300/49 Mbps (plan speed) · an offer price, no end date stated · nothing to pay upfront"Free activation"; 150 Mbps speed guaranteeGo to BT
- £33.66 a month over 24 monthsadvertised at £28.99 · then £32.99 from 31 March 2027, then £36.99 from 31 March 2028 · up to 500/73 Mbps (plan speed) · an offer price, no end date stated · nothing to pay upfront"Free activation"; 425 Mbps speed guaranteeGo to BT
- £34.66 a month over 24 monthsadvertised at £29.99 · then £33.99 from 31 March 2027, then £37.99 from 31 March 2028 · up to 900/110 Mbps (plan speed) · an offer price, no end date stated · nothing to pay upfront"Free activation"; 700 Mbps speed guaranteeGo to BT
Related questions
- Which is cheaper at the same speed, BT or Three?
- Among the plans priced here: at 100 Mbps or better, Three 5G Home Broadband, 24 month costs £20.79 a month against BT Full Fibre 150 at £31.66.
- Do BT and Three raise prices during the contract?
- BT publishes a rise on 7 of its 7 plans ranked here; Three publishes a rise on 2 of its 2 plans ranked here. Each rise is on the row it belongs to, in the provider's own words and dates.
- Can I get these where I live?
- Which providers reach an address depends on the postcode, and a row says so where its provider's page limits the price to a place. The postcode check on the main UK page shows which plans can apply where you live; the provider's own checker has the final word.
Where this comes from
Dated 2026-11-15. Nothing is estimated beyond arithmetic the page names, and no provider pays to appear.