Lucky for us, Spirit Airlines has taken the liberty of answering this question for us in a handy-dandy, regularly-updated chart:
I just checked Spirit’s website, and a flight to Miami/Ft Lauderdale (~1,500 miles) leaving Friday May 13th from New York at 7:50pm is $79 (+$18.70 in taxes/fees). According to the above chart, $62.06 of that, or the vast, vast majority (78.5%, pre-tax/fees) of the cost goes just to fuel. I’ve yet to see anything of this sort from the Majors, but I’m curious what their cost structure looks like; I expect fuel is a far lower % (relatively) than it is for a discount carrier like Spirit. A flight on the same day to LA, for comparison, is $199 (+$29.40 in taxes/fees), with fuel accounting for ~62% of the pre-tax/fee cost.
It may be an interesting exercize to track Spirit’s #’s over time to see if they change how they pass-on fuel cost changes to passengers. We’ll check back down the road to check it out.