Phonetically, 'deal' and 'feel' work the same way. The present tense has a long vowel (feel ), while the past has a short vowel (felt). 'Deal' is the same - the present is long (deal), while the past is short - it's pronounced as if it were spelt 'delt'. The only confusing thing is that the spelling retains its double vowel. Sorry, English spelling is a bit of a nightmare - we do realise that!

You pronounce "dealt" as in "delta". http://howjsay.com/index.php?word=dealt