** Shares of online travel agency Booking Holdings BKNG.O down 4.2% in extended trading

** Co posts upbeat quarterly results helped by international travel

** BKNG posts Q1 adjusted profit of $24.81 per share, compared with analysts' average estimate of $17.33 per share, according to data compiled by LSEG

** BKNG posts Q1 revenue of $4.76 bln, compared to analysts estimates of $4.59 billion

** 28 of 40 brokerages rate the stock "buy" or higher and 12 "hold"; their median PT is $5,580 - LSEG data

** As of last close, stock down 0.71% YTD

(Reporting by Anshuman Tripathy)

((Anshuman.Tripathy@thomsonreuters.com))