Deal found on September 12, 2026
San Diego to Denver
$71$23670% off
Round trip
Frontier has San Diego to Denver nonstop fares down to $71, about 72% below the usual $257 we typically track on this route. Fall travel dates are open, ideal for a quick mountain getaway or a cheap jumping-off point before ski season ramps up. This is one of the lowest fares we've seen on this route in recent months.
Travel dates
Dates in October
e.g. Oct 20 – Oct 29 · 9 nights
Date options
6 at this price
Lowest we've seen
$38
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