Virgin Australia has not increased its fares and is hedged across both fuel and refining margins, leaving it much less exposed to global volatility.
Jet fuel prices have surged much faster than oil prices and are up 150 per cent in the past fortnight.
Although Qantas has hedged 82 per cent of its second-half jet fuel costs against the Brent crude benchmark, its refining margins are unhedged, leaving it exposed to some of the fluctuations.
Air New Zealand said the spread had widened from about $US22 a barrel before the conflict to as high as $US115 a barrel, as it withdrew guidance on jet fuel volatility.
Evans and Partners analyst Cameron McDonald said the blowout in spreads would result in Qantas fuel costs increasing by $14.8 million a day.