All patients in Calderdale had some access to out of hours appointments with a doctor at the end of September, according to NHS figures.
Data gathered from 25 practices in the NHS Calderdale CCG during the month showed that 90 per cent of patients, that's 195,494 people, could book an appointment on Saturday, Sunday or out of hours on a weekday. A further 10 per cent or 22,869 people had access at some of those times.
Read: Community Foundation for Calderdale works with Picture House on successful project
The national figures for September showed that 94 per cent of patients in England had access to appointments during some extended hours, and 55 per cent of patients had full access.
Only five clinical commissioning group areas in England recorded seven-day access for all patients at the end of September.
The poorest record was in NHS Liverpool CCG where 59 per cent of patients had no access to extended appointment hours.
Across the country the position has improved since the data was collected, according to NHS England.
A spokesman said: "This programme has gathered momentum since September with evening and weekend appointments now available to more than 98% of patients. We are well on track to hit the 100 per cent target, originally set for March 2019 but brought forward so more appointments are available this winter.”
Read: New waste permit scheme to be introduced at Calderdale's tips
But doctors' leaders have cautioned that the push for extended hours may damage the 'core service' they offer in regular hours on weekdays.
The Government says that everyone should have "more convenient access to GP services, including appointments at evening and weekends."
NHS England says that the additional capacity will help to ease pressure on doctors and A&E.
Under extended hours, doctors offer appointments on Saturday, Sunday and on weekdays in the early morning and after 6.30pm. In most instances, practices get together to form hubs or federations that provide the service, so patients may not see their usual doctor.
Read: Average Briton will work 75 hours overtime in November and December to afford Christmas research reveals
Dr Richard Vautrey, BMA GP committee chair, said that GPs want to give patients more access to appointments but underfunding and staff shortages made it difficult.
He said: "Many practices have worked hard to establish extended hours schemes but the phased implementation, as a result of the gradual release of funding over a number of years by NHS England, means that some areas are at an earlier stage of development than others.
"We still believe the money invested in such programmes would be better spent improving core GP services and enable more patients to get an appointment during the daytime when most prefer to see their local GP.
“We know that patients are frustrated with being unable to get timely appointments during regular working hours, owing to increased demand and unmanageable GP workloads, and therefore it is these services that should be priority for proper funding.”
Across England there are 7,015 practices and 6,656 of them provided data.