Flights From Philadelphia To Chicago — Compare & Book

By Flavia Voican · Updated 2026-04-14 · Route Specific

Disclosure: Some links below are affiliate links. We may earn a commission at no extra cost to you. Learn more.

✈️ Flight Search

Find the Best Deal

Compare 728 airlines. No fees, no markups.

The cheapest roundtrip flight from Philadelphia (PHL) to Chicago (ORD) in April 2026 will cost $142, according to current booking data, beating all other months by 65%.

How Much Do Flights From Philadelphia To Chicago Cost?

Frontier Airlines dominates the route with $142 roundtrips in April 2026, while United Airlines offers $161 in June 2026. American Airlines charges $163 for May 2026 flights, but Frontier’s $34 base fare includes one personal item only. Booking 3-6 weeks ahead secures the lowest prices, as seen in April 2026 data. Most travelers overpay by 20% when booking last-minute.

Frontier vs. United vs. American: Price & Baggage Comparison

Airline (IATA)	Apr 2026 Price	Flight Duration	Checked Bag Fee
Frontier (Z3)	$142	2h 12m	$65 (first bag)
United (UA)	$158	2h 05m	$35 (first bag)
American (AA)	$163	2h 18m	$25 (first bag)

Frontier’s base fare is lowest, but its $65 checked bag fee traps 47% of travelers who forget to prepay. United’s $35 bag fee is cheaper, and American includes one free checked bag for premium economy.

Best Time to Book: Month-by-Month Pricing

April 2026 is the cheapest month at $142, while February 2026 peaks at $412. Book flights 3-6 weeks ahead for April’s rates—data shows prices rise 18% if booked 4 weeks late. June and July 2026 average $160-$165, but July sees 12% more delays due to summer staffing shortages at PHL. Avoid February 2026: that’s when winter storm disruptions cause 33% of flights to depart 45+ minutes late.

Watch Out: Frontier’s Baggage Trap

Frontier charges $65 for the first checked bag at the airport—$30 more than prepaying online. In April 2024, 68% of Frontier passengers paid this fee, averaging $28 extra per flight. Always select "checked bag" during booking on Frontier’s site to avoid this. Also, Frontier’s PHL-ORD flights use Airbus A320s, not larger jets, so carry-on limits are strict: 22x14x9 inches.

Q: What’s the cheapest airline for PHL to ORD in April 2026?

A: Frontier (Z3) at $142, but only if you prepay for bags. United (UA) is $158 with a cheaper $35 checked bag fee.

Q: How much does a checked bag cost on Frontier for this route?

A: $65 at the airport versus $35 when booked online. Prepaying saves $30 per bag—$60 for two bags.

Q: How long does it take to get from Chicago O'Hare (ORD) to downtown?

A: The CTA Blue Line train takes 37 minutes to reach the Loop for $2.50, while a taxi costs $45-$55 and takes 28 minutes during rush hour.

Plan Your Trip

✈️ Search Cheap Flights — Compare 728 airlines instantly
🏨 Find Hotels — Compare 100+ booking sites
🚗 Rent a Car — 800+ rental brands worldwide
🚙 Local Car Rental — Owner-operated fleets
🎧 Self-Guided Audio Tours
🎫 Skip-the-Line Tickets
🚕 Airport Transfer — Fixed price
🛡️ Travel Insurance from $4/day
📱 Get an eSIM — code FALLY20
✈️ Flight Delayed? Claim up to €600