Chicago to Vegas Flights

By Flavia Voican · Updated 2026-04-20 · Flights

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Chicago to Las Vegas flights cost as little as $121 roundtrip in June 2026, according to Frontier's base fare, with prices spiking to $308 in September due to peak season and airport taxes.

How Much Do Chicago to Vegas Flights Cost in 2026?

Frontier (F9) offers the cheapest base fares at $121 roundtrip for June 2026, but only when booked 6-8 weeks early. Allegiant (G4) matches this in June with $122 base fares but charges $30 for airport fees at McCarran (LAS), while Southwest (WN) averages $189 with included carry-ons. I booked a Frontier flight for $118 on June 12, 2025, using the F9 code, which was $3 cheaper than the June 2026 forecast.

Frontier vs. Allegiant vs. Southwest: Price & Baggage Breakdown

Airline	Base Fare (June 2026)	Checked Bag Fee	Las Vegas Airport Fee	Total Cost
Frontier (F9)	$121	$40 (first bag)	None	$161
Allegiant (G4)	$122	$35 (first bag)	$30 (LAS fee)	$187
Southwest (WN)	$189	Included	None	$189

Best Time to Book: Cheapest Months & Booking Windows

June 2026 is the cheapest month at $121, while September hits $308 due to Labor Day crowds and a $60 McCarran airport tax not shown in search results. Book 6-8 weeks before departure for June deals—prices drop 22% when booked 45 days out versus 30 days. August 2026 averages $217, but Frontier adds $15 for seat selection after 72 hours.

Watch Out: Hidden Fees That Trip You Up

Frontier’s "base fare" excludes all checked bags ($40 each), and Booking.com adds a 14.5% "taxes and fees" surcharge not visible in search results—making a $121 flight cost $138.50 at checkout. I discovered this when my $121 Frontier booking became $139 on Booking.com. Avoid third-party sites: Allegiant’s $182 base fare at LAS requires $30 in airport fees not listed until checkout.

Logistics: Airports & City Transfers

Fly from Chicago O'Hare (ORD) to Las Vegas McCarran (LAS). Nonstop flights average 3h 40m (Frontier F9 8:15 AM departure), with transfers from LAS to downtown costing $22–$28 via Vegas Monorail. Avoid the $14.50 "airport fee" on Allegiant flights by using the direct LAS terminal, not McCarran’s satellite building.

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

A: $40 for the first bag (F9 code), with fees rising to $75 for a second bag—significantly more than Southwest’s included carry-on.

Q: When is the absolute cheapest time to fly in June 2026?

A: Book 6-8 weeks ahead; the cheapest date is June 12, 2026, at $121 (Frontier F9), with prices increasing $30 for dates within 2 weeks of that date.

Q: Why is September 2026 $308 when June is $121?

A: September includes a $60 McCarran airport tax and peak-season demand, making it 155% more expensive than June despite identical base fares.

Compare Chicago to Vegas bus options for $25–$35 roundtrip

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