Michael O'Leary said Ryanair is in the market for about 200 new planes as the low-cost airline's fleet is poised to reach 300 Boeing 737-800 jets later this year.
Ryanair is in talks with Boeing, he added during a press conference in Oslo.
"Boeing have plenty of availability in the order book," Mr O'leary said. "We are in the fairly early stages of talks to see if we can reach an agreement on price."
Mr O'Leary said that Ryanair is looking for deliveries in 2015, 2016 and 2017 – the year that Boeing's upgraded 737 Max jetliner is due to enter service.
The Ryanair boss said that a new order was possible this year to help expand passenger numbers to 120 million.
"We are talking to 60 new airports we do not fly to it, some in Israel, we are inundated with requests and airport deals at the moment. We are frankly less enthused by Russia, Ukraine and those countries at the moment."
Mr O'Leary predicted that the incumbent carriers in Scandinavia and Poland won't survive in their current form amid competition from domestic and foreign low-cost rivals.
SAS Group, which owns Scandinavian Airlines, can't continue to rely on funding from Sweden, Denmark and Norway and is most likely to end up as a unit of Deutsche Lufthansa, while Poland's LOT has little room to pare operations that are already much reduced, Mr O'Leary said.