The vote excluded the Airport Police and the Fire Service
Two unions at the Dublin Airport Authority (DAA) have voted in favour of Workplace Relations Commission (WRC) proposals on their terms and conditions of employment.
Mandate and IMPACT accepted the deal, while four out of five SIPTU groups voted against it.
In an internal communication, DAA group head of employee relations John McCormack said: "I am disappointed to tell you the proposals have not been accepted and are withdrawn.
"We acknowledge that many of you had significant concerns about some elements of the proposals.
"We will take some time to consider the issues raised by you and remain committed to making sure we continue to listen and work with you to address them."
The proposals were contained in a company and union framework document. The vote excluded the Airport Police and Fire Service.
SIPTU organiser, Neil McGowan, said: "Following the vote against these proposals, union representatives will take time to consult with their workplace representatives and the wider membership to decide on the next steps in progressing their claim for improved terms and conditions employment."
The proposals reportedly would have seen pay rises of between 3% and 4% per annum over three years.
It comes as the airport is expecting to handle more than 340,000 passengers this May Bank Holiday weekend.
Passenger numbers are up 5% over the same weekend last year, according to Dublin Airport.