DUBLIN, July 22 (Reuters) - Ryanair on Monday

reported a 46% fall in after-tax profit for its April-June

quarter from the prior year, missing analyst estimates, and

warned that fares for its key summer months would be "materially

lower" than last year.

After tax-profit for the three months to the end of June,

the first quarter of Ryanair's financial year, was 360 million

euros ($392 million), well below the 538 million euro profit

forecast in a company poll of analysts.

Average fares per passenger fell 15% in the quarter from a

year earlier as the airline was forced to engage in "more price

stimulation than we had previously expected," Chief Executive

Michael O'Leary said in a statement.

"While Q2 demand is strong, pricing remains softer than we

expected, and we now expect Q2 fares to be materially lower than

last summer (previously expected to be flat to modestly up),"

O'Leary said, referring to the July-September quarter when

Ryanair typically makes most of its profit.

He said it was too early to forecast profit for the full

financial year, which ends on March 31.

The Irish airline, Europe's largest by passenger numbers,

has already seen its shares fall 24% from an April 8 peak, in

large part due to fare weakness.

($1 = 0.9184 euros)