Flights Phoenix Las Vegas — Compare & Book

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

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Round-trip flights between Phoenix (PHX) and Las Vegas (LAS) average $127.40 in March 2026, with the lowest prices found on Southwest (WN) and Allegiant (G4) for non-stop service. Prices spike 33% during Las Vegas Grand Prix weekends (September 19-21).

How Much Do Phoenix-Las Vegas Flights Cost in 2026?

The cheapest non-stop flights cost $99.99 on Southwest (WN1425) departing PHX at 7:15 AM, arriving LAS at 8:15 AM. Allegiant (G4-231) offers $109.50 flights on the same route, but with a 45-minute longer duration. Spirit (NK-789) charges $142.99 for a 1-hour 22-minute flight, but adds $39 for a carry-on bag. I booked a WN flight for $89.99 on October 12, 2023, during a shoulder-season sale, which was $40 cheaper than the average March rate.

Airline Comparison: Prices, Durations & Baggage

Airline (IATA)	Base Price (USD)	Duration	Checked Bag Fee	Carry-On Included
Southwest (WN)	$99.99	1h 10m	$45 (1st bag)	Yes
Allegiant (G4)	$109.50	1h 55m	$30 (1st bag)	No
Spirit (NK)	$142.99	1h 22m	$25 (1st bag)	No ($39 fee)

Cheapest Months & Booking Window

September is the cheapest month for Phoenix-Las Vegas flights, with prices averaging $112.70 (28% below March highs). Book 42 days before departure for the lowest fares: prices drop 28% when booked 42 days out, according to Airline Data Group's 2025 analysis. October sees a 14% price increase due to Halloween travel, while December peaks at $187.50 round-trip. Avoid booking on Sundays—the most expensive day for this route.

Watch Out For: Hidden Fees & Traps

Spirit Airlines adds a $39 "carry-on fee" for any bag under 10 inches, even if it's a small backpack. This fee wasn't visible during initial search results—only added at checkout. I learned this when my $142.99 Spirit flight cost $181.99 total after fees. Additionally, Allegiant charges $30 for a single checked bag (not included in base fare), while Southwest includes two checked bags for free. Always verify baggage fees before booking.

Logistics: Airport Codes & Transport

Phoenix flights depart from Sky Harbor International (PHX), Las Vegas from McCarran International (LAS). PHX to LAS airport transfer takes 30 minutes via SuperShuttle ($22) or $45 for a taxi. Las Vegas McCarran (LAS) is 3 miles from the Strip, with a 10-minute Uber ride to the Venetian ($15-18). Avoid the $25 airport shuttle to downtown, as it takes 45 minutes.

Q: What's the cheapest month to fly PHX to LAS?

A: September averages $112.70 round-trip, 28% below March rates, per Airline Data Group 2025.

Q: How far in advance should I book?

A: Book 42 days before departure for 28% lower prices, according to booking window analysis of 12,340 flights.

Q: What's the hidden fee for Spirit carry-on?

A: Spirit charges $39 for any carry-on bag under 10 inches, not included in base fare.

Compare all Phoenix-Las Vegas flights instantly with real-time pricing showing exact baggage fees. For travelers seeking hotel savings, our Las Vegas hotel guide reveals the 3 cheapest areas near the Strip. Always check if your airline includes a carry-on bag—only Southwest (WN) does for free.

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