Ryanair's full year profits have fallen 29 per cent to €1.02 billion (£890m), the company said.
The company saw traffic growth of 7% and a decline in fares of 6% in the year to March 31 2019.
Revenues at the low-cost airline grew 6% to €7.5bn (£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%, we are guiding broadly flat Group profits."
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It said: "This will range from €750m (£660m) if RPP rises 2%, 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."
Estate agent Foxtons has said there was no improvement to a "very challenging" London property market in recent trading, as buyers are put off by Brexit uncertainty.
It came as the London-listed company reported revenue of £23.8 million for the three months to March 31, down from £24.5m this time last year.
This was due to a decline in sales revenue from £8.2m to £7.1m in the period amid record low levels of house sale volumes.
The number of takeovers in the UK's retail sector tumbled over the past year, as Brexit uncertainty clouds the future of the high street.
According to law firm RPC, the number of merger and acquisitions (M&A) was down 24% in the year to March 31, with a total of 27 going through.
This compared to 37 transactions in the prior year, as dealmakers delayed decisions over the impending threat of Brexit.
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