FlyAway fares between the airport and Westwood will remain at $5 each way.
All increases will take effect in August.
This is the second fare increase in less than a year. The last fare increase was in January.
The L.A. Airport Commission is considering a new service between Irvine and the airport. A decision on the proposed service is expected within the next two months.
Despite the fare increases, Airport Commission officials say the airport bus service is a bargain.
The FlyAway bus network carried more than 1.5 million passengers last year.
City News Service contributed to this report.