Security was stepped up at Madrid's airport on Wednesday, and passengers travelling to Turkey waited for updated flight information after after a series of blasts at Istanbul's Ataturk airport.
Extra police cars and armed officers were seen outside the airport's terminal two, where flights depart for Istanbul.
Spanish police declined to confirm whether the heavier security was a direct result of the attacks in Turkey.
Spain maintains the country's terror alert level at four, the second highest there is.
Spain's airport operator AENA said flights between Madrid and Istanbul were operating with several hours' delay, but that there were no cancellations on Wednesday.
Most passengers said they were intending to continue with their travel plans despite the situation in Istanbul.
Around 236,000 Spanish tourists visited Turkey in 2015, according to the Turkish Embassy in Madrid. Istanbul's Ataturk Airport is well connected with Spain, with flights to Madrid, Barcelona, Valencia, Malaga and Bilbao.
The attack on Europe's third-busiest airport was the deadliest in a series of suicide bombings this year in Turkey.