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Cheap flights from Philadelphia to Austin

The cheapest round trip from Philadelphia to Austin that travelers found recently is $454 with a carry-on: a $344 fare on Frontier plus about $110 for a carry-on both ways. It leaves Mon, Dec 28 and comes back Thu, Dec 31.

Live prices for Mon, Dec 28 to Thu, Dec 31

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$454Cheapest round trip, carry-on included (est.)
$566Typical round trip found recently
DecemberCheapest month in the next few, from $454
0%Of these fares are nonstop

Cheapest trips travelers found recently

LeaveReturnAirlineAirportsStopsFareCarry-on (est.)TotalLive prices
Mon, Dec 28Thu, Dec 31FrontierPHL → AUS1 stop$344+$110$454Live price
Fri, Oct 23Sun, Oct 25FrontierPHL → AUS1 stop$456+$110$566Live price
Mon, Mar 15Sun, Mar 21FrontierPHL → AUS1 stop$460+$110$570Live price

Round-trip prices per person, from real fares travelers found in the last few days. Carry-on fees are our estimate for each airline, both ways. Prices change fast: check the live price before you book.

Cheapest month to fly

MonthCheapest tripFromLive prices
October 2026Fri, Oct 23 to Sun, Oct 25, 2 nights$566Live price
December 2026Mon, Dec 28 to Thu, Dec 31, 3 nights$454Live price
March 2027Mon, Mar 15 to Sun, Mar 21, 6 nights$570Live price

Bag fees on this route

What the airlines flying Philadelphia to Austin usually charge for one bag each way. Budget airlines often sell the cheapest fares and charge the most for bags, so compare the total, not the fare.

AirlineCarry-on, each wayChecked bag, each way
Frontier$55$50

Our estimates: fees depend on the fare type and when you pay. Check the airline's own price when you book.

How these prices work

These are real round-trip fares that travelers found on Aviasales recently, not a live search, so they can change or sell out. Dipt adds an estimate of each airline's carry-on fee, so a cheap fare with expensive bags doesn't look cheaper than it is. "Live price" opens Dipt's live flight search for those dates, where you book with the airline or travel site you pick. Dipt may earn a commission when you book, at no extra cost to you (how Dipt makes money).

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