The time it takes to travel from the CBD to Melbourne Airport has increased from 35 to 42 minutes in the past two years.

It's the greatest growth in peak travel time in any major Australian city, according to new data from ride sharing service Uber.

One week after Premier Daniel Andrews announced that construction on an airport rail link would start within 10 years, data from 20,000 Uber drivers in Melbourne has revealed that afternoon peak travel time between the city and the airport reached a high of 46 minutes in the first quarter of the year.

This is the longest city to airport trip in any major Australian city.