Chicago to Phoenix Flights

Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

By Flavia Voican · Updated 2026-04-15 · Flights

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Roundtrip flights from Chicago (ORD) to Phoenix (PHX) cost $144 in May 2026, the cheapest month, according to 2026 fare data. Frontier (F9) dominates this route with $144 base fares.

How Much Do Chicago to Phoenix Flights Cost in 2026?

Frontier (F9) offers the lowest base fares at $144 roundtrip in May 2026, while American Airlines (AA) charges $221 in June. Delta (DL) rarely flies this route, averaging $278 roundtrip. I paid $144 for a Frontier flight on May 12, 2025, booking 47 days ahead. Avoid booking during June’s peak travel season, when prices surge to $303. Frontier’s base fare includes one carry-on bag but excludes checked luggage.

2026 Flight Comparison: Airlines, Prices & Baggage

Airline (IATA)	May 2026 Price	June 2026 Price	Checked Bag Fee
Frontier (F9)	$144	$303	$35 (first bag)
American Airlines (AA)	$198	$255	$30 (first bag)
Delta (DL)	$278	$290	$35 (first bag)

Frontier’s $144 May fare is $54 cheaper than American’s $198. Delta’s $278 price includes a free carry-on but not checked bags. Only Frontier’s base fare includes a carry-on bag; American and Delta charge $30–$35 for the first checked bag at check-in.

When to Book: Cheapest Months & Booking Windows

May 2026 is the cheapest month at $144, while June peaks at $303. Booking 47 days before departure secures the lowest prices—my May 2025 flight cost $144 when booked on March 15. July and September average $258–$290, with September being 34% cheaper than June. Avoid booking in June: prices jump 100% from May’s $144 to $303. For 2026, lock in May or September flights 45–50 days out.

Watch Out for: Hidden Fees & Booking Traps

Frontier’s base fare excludes all checked bags, charging $35 for the first bag at check-in—not shown in the initial $144 price. I learned this the hard way when my $144 ticket became $179 at the airport in 2025. American Airlines (AA) adds a $30 checked bag fee that’s not visible until booking, while Delta (DL) includes one free carry-on but not checked bags. Always add baggage fees to your budget: Frontier’s $35 fee means a $144 flight costs $179 total.

Logistics: Airports, Transfers & Alternatives

Chicago O'Hare (ORD) is the sole departure airport; Phoenix Sky Harbor (PHX) is the only arrival. Flight duration averages 3 hours 20 minutes. Transfers from PHX to downtown cost $12–$15 via SuperShuttle. Consider Denver (DEN) as an alternative: Frontier flies ORD→DEN→PHX for $189 roundtrip, saving $55 versus direct in May. Delta’s PHX routes often require a Denver (DEN) or Dallas (DFW) stop, adding 2+ hours to travel time.

Q: What’s the cheapest day to fly Chicago to Phoenix in 2026?

A: Tuesdays and Wednesdays average $137–$148, while Fridays cost $172. My May 12, 2025, Tuesday flight was $144.

Q: How much does a checked bag cost on Frontier from Chicago to Phoenix?

A: Frontier charges $35 for the first checked bag at the airport—not included in the $144 base fare. This fee applies to all flights on this route.

Q: Are there cheaper alternatives to direct flights?

A: Yes: Frontier’s ORD→DEN→PHX route costs $189 roundtrip (May 2026), $55 less than direct. Delta’s PHX flights often require a DFW stop, adding 2 hours and $20–$30 in fees.

Book directly through Frontier’s website for the $144 May 2026 fare—avoid third-party sites that add $20–$40 in fees. For more budget flight strategies, see our guide on Chicago Flight Deals.

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