Route Price Intelligence
Cheap Flights From St. Louis to Philadelphia
Live pricing benchmarks, monthly patterns, and historical lows for this route.
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.
✓ 15 date combinations found at this price
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Best Time to Fly from St. Louis to Philadelphia
The cheapest time to fly from St. Louis to Philadelphia is typically May, when fares average around $201. The most expensive month tends to be December at around $482. For the best deals, consider flying in May, June, April.
Typical Price by Travel Month
Median round-trip fare for each month, with the typical price range, from our ongoing tracking of this route