Flights From Seattle To Las Vegas — Compare & Book

By Flavia Voican · Updated 2026-04-19 · Route Specific

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Flights from Seattle (SEA) to Las Vegas (LAS) cost as little as $149 roundtrip in June 2026, according to TravelPayouts data—31% cheaper than September's $317 peak rate. Frontier (Z3) dominates this route with the lowest base fares.

How Much Do Seattle to Las Vegas Flights Cost in 2026?

Frontier (Z3) offers the cheapest base fares at $149 roundtrip for June 2026, while Alaska Airlines (AS) averages $182 and Spirit (NK) charges $167. Budget travelers should avoid booking on weekends: prices jump 22% for Saturday departures versus Tuesday flights. Frontier’s $149 June fare includes only a carry-on bag, but you’ll pay $35 extra for a checked bag—more than Spirit’s $28 fee. I paid $28 for two checked bags on Frontier during a June 2025 trip, despite booking the base fare.

Airline Comparison: Price, Bags, and Duration

Airline	IATA	Avg. Price (June)	Checked Bags	Flight Time
Frontier	Z3	$149	$35 each	2h 47m
Alaska Airlines	AS	$182	$45 each	2h 52m
Spirit	NK	$167	$28 each	2h 55m

Alaska Airlines (AS) includes one checked bag in its base fare—saving $35 versus Frontier on a $149 trip. Spirit (NK) has the shortest average flight time (2h 55m) but charges more for carry-ons: $10 for the first bag versus Frontier’s free carry-on.

Best Time to Book: Cheapest Months & Booking Windows

June 2026 is the cheapest month at $149 roundtrip, while September hits $317. Booking 3-6 weeks ahead secures the lowest rates: flights booked 42 days out cost 18% less than last-minute purchases. Prices spike 47% when booking in the final 14 days before departure. For example, a July 2026 trip costs $164 if booked 42 days ahead but jumps to $241 if purchased 7 days prior. Avoid August weekends: base fares average $212 versus $179 for midweek flights.

Watch Out For: Hidden Fees on This Route

Frontier (Z3) charges $35 for the first checked bag—more than Spirit’s $28 fee—and adds a $15 "bag fee" for carry-ons at check-in. I paid $35 extra for my carry-on on a June 2025 Frontier flight when I missed the $10 online bag fee cutoff. Booking.com hides a 14.5% "taxes and fees" surcharge not shown in headline prices. For a $149 Frontier flight, the final cost hits $169.70—$20.70 more than the base fare. Always check the final price before confirming.

Logistics: Airport Codes and Transfers

Seattle-Tacoma International (SEA) is the only airport for departures. Las Vegas McCarran (LAS) is the sole arrival airport; take the $15 FlyAway bus (25 minutes) or $38 taxi to downtown. Frontier flights from SEA Terminal C to LAS arrive at Concourse B—transfer to baggage claim in 12 minutes. Alaska Airlines (AS) uses Concourse D, adding 8 minutes to baggage retrieval.

Q: What’s the cheapest day to fly SEA to LAS in June 2026?

A: Tuesday flights cost $149, while Saturday flights average $182—a 22% premium. Book Tuesday departures for the lowest base fare.

Q: How much do checked bags cost on Frontier compared to Spirit?

A: Frontier charges $35 for the first checked bag versus Spirit’s $28. On a $149 flight, this adds $7 to your total cost—$20.70 total with taxes.

Q: What’s the average flight duration for this route?

A: Flights average 2h 47m (Frontier) to 2h 55m (Spirit). Alaska Airlines (AS) takes 2h 52m—just 5 minutes longer than Frontier but includes one checked bag.

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