Deal found on July 24, 2026
St. Louis to Philadelphia
$268$36727% off
Round trip
Philadelphia usually costs about $471 from St. Louis, and this fare is down to $268 on Frontier with one stop, a 43 percent discount, with dates open August through November. Philly's museums, food scene, and easy train connections to New York and DC make it a strong value pick this week.
Travel dates
Oct 31 to Nov 9
Date options
15 at this price
Lowest we've seen
$136
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