prices we've seen · United States fares · USD
The cheapest one-way fare from Chicago (ORD) to Philadelphia (PHL) we have seen is $119 USD, departing Nov 25, 2026 (seen Nov 7, 2026): Frontier F9 2205, 1 stop, 8h 6m.
Cheapest · One wayseen Nov 7
$119 USD
Frontier F9 2205 · Nov 25 · 1 stop · 8h 6m
Continue on the seller's site — $119Cheapest round tripseen Nov 10
$258 USD
Frontier F9 2114 · Dec 30 → Jan 4 · 1 stop · 13h 23m in all, both ways
Continue on the seller's site — $258a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
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Checked Nov 11
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Each day's cheapest fare we've seen, nonstop and with stops. Cheapest first.
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The cheapest round trips we've seen on this route, on any dates, cheapest first.
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Compared with Chicago → Philadelphia: $119 one way (Nov 25).
Marketing carriers; the operating airline is shown by the seller.
The cheapest one-way fare from Chicago (ORD) to Philadelphia (PHL) we have seen is $119 USD, departing Nov 25, 2026 (seen Nov 7, 2026): Frontier F9 2205, 1 stop, 8h 6m.
Nonstop fares were seen on 5 of the 5 departure dates; carriers seen: American Airlines, Frontier.
By month, Nov 2026 is the cheapest we've seen at $119 USD and Mar 2027 the most expensive at $158 USD — a spread of 33%.
It is the cheapest fare we've seen for that date; the date beside it is the day it was seen, or our last check. We look again at least once a day for the routes people search, and stop showing a route's prices two days after our last look. The seller's page shows the price right now.
By price and duration only; commission never enters the order. Cheapest means cheapest among the fares we've seen for this route. A click that books may earn a2bflight a commission from the seller; the price you see is the seller's own. See how we rank and what we keep.