$105 Find Cheap Flights from Philadelphia to Boulder - Compare and Save

When flying out of Philadelphia you’ll be using Philadelphia. Boulder does not have its own airport so you’ll be flying into nearby Denver Intl airport, which is 33.4 mi away.

Direct flights cover the 1,553 miles separating Philadelphia and Boulder in about 3h 50m.

25 direct flights run between Philadelphia and Boulder on a daily basis. On average, there are about 176 departures each week.

Consider leaving on a Thursday and avoid Saturdays if you are looking for the best rates. For your return to Philadelphia, you’ll find the best rates on Saturdays and the most expensive ones on Mondays.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Boulder.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boulder from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Boulder with an airline and back to Philadelphia with another airline.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Boulder from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

In the last 5 days, the cheapest one-way ticket between Philadelphia and Boulder found on KAYAK was with Frontier for $63. Frontier offered a round-trip connection from $97 and United Airlines from $201.