Arriva Cymru says bus services will stop from Sunday unless a last minute resolution to avoid strike action is reached.
Last night Unite said that last ditch talks to avert strike action have ended without a deal.
They said that five weeks of strike action by .
Arriva have now said this will mean services in North Wales and Chester will stop from Sunday - with around 400 drivers involved in the action.
The firm said it had put forward an improved offer and hoped to reach a "full resolution" to avert the action.
Unite say Welsh workers were offered a 29p an hour increase whilst Arriva workers over the border in the North West of England have been offered 39p.
In addition to this the current pay differential between Welsh and North West Arriva drivers is £1.81 an hour, they said.
If no deal is reached 400 Unite members working at depots, including Amlwch, Bangor, Hawarden (Chester), Llandudno, Rhyl and Wrexham, will strike continuously from 6am on Sunday 14 November 2021 until 1am on Sunday 19 December.
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Unite say as it stands the action will move ahead this weekend.
Arriva Cymru said: “Further to on-going talks this week with our Trade Unions partners, Unite, we have put forward another improved offer which is highly competitive and this will be taken to a fresh ballot with our colleagues on Thursday and Friday this week.
"We want to reach full resolution with this latest offer, but for any of our customers who are planning to travel from Sunday, we would strongly urge them to check for updates before they travel.
"If a strike goes ahead, regrettably Arriva Buses Wales will not be able to run from Sunday. We will provide an update as the situation becomes clearer in the coming days.”
Unite General Secretary Sharon Graham said: "Arriva Cymru have chosen not to offer their loyal Welsh workforce the pay offer they deserve.
"Their failure to tackle poverty pay will now result in severe disruption to bus services and the people of North Wales.
"Our members are united and they will receive the full backing of Unite over the next five weeks of strike action."
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Jo Goodchild, Unite Regional Office, said: "Arriva Cymru have completely misjudged the level of anger there is amongst its workforce.
"Welsh workers are not willing to accept inferior terms and conditions to their colleagues in other parts of the 海角视频."