Despite boasting record passenger numbers, the low-cost carrier made a pre-tax loss of £236m in the six months to the end of March compared to a £18m loss in the same period last year.
Headline losses also deepened by £191m to £212m.
Total revenue grew 3.2% to £1.827bn and as the airline flew a record 33.8 million passengers in the six months - up 9% from a year before.
Revenues over the period rose slightly by 3.2% while load factor also rose by 0.5 percentage points to 90.2%.
EasyJet announced it would be launching its largest pilot recruitment drive in June, as it looks for an additional 450 pilots.
