MADRID, July 19 (Reuters) - Spain's Treasury announced the following results at Thursday's bond auction where it sold 4.5 billion euros of bonds. Following are the details of the sale in millions of euros: July 30, 2023 bond LATEST PREVIOUS AUCTION DATE July 19, 2018 June 21, 2018 ISSUE MATURITY July 30, 2023 July 30, 2023 COUPON (PCT) 0.35 0.35 HIGHEST YIELD (PCT) 0.337 0.354 AVERAGE YIELD (PCT) 0.313 0.336 AVERAGE PRICE 100.179 100.069 TOTAL BIDS (MLN) 2,009 3,241 ALLOTTED (MLN) 1,289 2,001 BID/COVER RATIO 1.6 1.6 July 30, 2026 bond LATEST PREVIOUS AUCTION DATE July 19, 2018 May 17, 2018 ISSUE MATURITY July 30, 2026 July 30, 2026 COUPON (PCT) 5.9 5.9 HIGHEST YIELD (PCT) 0.975 1.086 AVERAGE YIELD (PCT) 0.953 1.073 AVERAGE PRICE 138.006 137.648 TOTAL BIDS (MLN) 1,161 1,441 ALLOTTED (MLN) 831 744 BID/COVER RATIO 1.4 1.9 July 30, 2028 bond LATEST PREVIOUS AUCTION DATE July 19, 2018 NA ISSUE MATURITY July 30, 2028 July 30, 2028 COUPON (PCT) 1.4 1.4 HIGHEST YIELD (PCT) 1.321 NA AVERAGE YIELD (PCT) 1.308 NA AVERAGE PRICE 100.851 NA TOTAL BIDS (MLN) 1,964 NA ALLOTTED (MLN) 1,337 NA BID/COVER RATIO 1.5 NA July 30, 2033 bond LATEST PREVIOUS AUCTION DATE July 19, 2018 June 21, 2018 ISSUE MATURITY July 30, 2033 July 30, 2033 COUPON (PCT) 2.35 2.35 HIGHEST YIELD (PCT) 1.814 1.848 AVERAGE YIELD (PCT) 1.798 1.830 AVERAGE PRICE 107.201 106.792 TOTAL BIDS (MLN) 1,489 1,480 ALLOTTED (MLN) 1,089 743 BID/COVER RATIO 1.4 2.0 (Reporting by Paul Day; Editing by Sonya Dowsett)