Ryanair's full year profits have fallen 29 per cent to 1.02 billion euros (£890m), the company said.
The company saw traffic growth of 7 per cent and a decline in fares of 6 per cent in the year to March 31 2019.
Revenues at the low-cost airline grew 6 per cent to 7.56 billion euros (£6.6bn) over the same period.
Michael O'Leary, chief executive of Ryanair, said he is expecting "broadly flat group profits" into the financial year ending in 2020 - when their reporting will include Lauda in the consolidated Ryanair Group - but this is dependent on "no negative Brexit developments".
The company said: "Assuming revenue per passenger (RPP) growth of 3 per cent, we are guiding broadly flat Group profits.
"This will range from 750 million euros (£660m) if RPP rises 2 per cent, up to 950 million euros (£830m) if RPP rises 4%.
"This guidance is heavily dependent on close-in peak summer fares, H2 prices, the absence of security events, and no negative Brexit developments."
The company also said it had delayed the delivery of five Boeing 737-Max aircraft until winter - with no meaningful cost benefit from the delivery expected until the financial year ending in 2021.
It said: "We continue to have utmost confidence in these aircraft which have 4 per cent more seats, are 16 per cent more fuel efficient and generate 40 per cent lower noise emissions."
Two Boeing 737-Max aircraft crashes - one in Ethiopia in March and another in Indonesia in October - killed 346 people, leading to the aircraft being temporarily grounded.
Michael O'Leary, chief executive of Ryanair, said: "As previously guided, Ryanair (excluding Austrian low-cost airline Lauda) reports a full year after tax profit of 1.02 billion euros (£890m).
"Short-haul capacity growth and the absence of Easter in Q4 led to a 6 per cent fare decline, which stimulated 7 per cent traffic growth to over 139 million (142 million guests including Lauda).
"Ancillary sales performed strongly up 19 per cent to 2.4 billion euros (£2.1bn), which drove total revenue growth of 6 per cent to 7.6 billion euros (£6.6bn)."
The board of the company has also approved a 700 million euro (£610m) share buyback which will commence later this week and run over the next year.
Thomas Cook slumps into £1.5bn loss as Brexit uncertainty delays holiday plans
Travellers are going to be able to fly to Menorca much earlier in the summer season next year
