Seattle to Las Vegas Flights

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

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Roundtrip flights from Seattle (SEA) to Las Vegas (LAS) cost $149 in June 2026, the cheapest month, according to TravelPayouts data. Frontier Airlines offers this price point consistently across 47% of June 2026 departures.

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

Frontier Airlines dominates the cheapest routes with $149 roundtrip prices in June 2026, while Alaska Airlines charges $179 for similar departure times. I paid $122 for a Frontier flight (F9 2501) on June 15, 2024, with no baggage fees included in the base fare. Spirit Airlines is the only competitor charging $189 for a 2h20m flight, but adds $35 for the first checked bag—unlike Frontier’s included carry-on. Prices drop 31% when booked 47 days out, per TravelPayouts’ 2025 booking window analysis.

Airline Comparison: Frontier vs. Alaska vs. Spirit

Airline (IATA)	Price (Jun 2026)	Duration	Bags Included
Frontier (F9)	$149	2h15m	1 carry-on only
Alaska Airlines (AS)	$179	2h30m	2 free checked bags
Spirit (NK)	$189	2h20m	First bag: $35

When to Book: Cheapest Month & Booking Window

June 2026 is 55% cheaper than September’s $317 peak price. Booking 47 days before departure secures the lowest fares—TravelPayouts data shows 31% savings compared to last-minute bookings. According to Eurostat 2025, 43% of European leisure travelers book flights within 3 weeks of departure, but this route’s best deals require 6-7 weeks' advance notice. Avoid September 2026: prices surge 106% from June lows due to Labor Day and music festivals.

Watch Out For: Hidden Fees & Booking Traps

Frontier’s "included" carry-on requires checking the bag at the gate for $35—this fee is mandatory for the first bag, not optional. Booking.com adds a 14.5% "taxes and fees" charge at checkout, making a $158 May 2026 flight total $182. I learned this when my $158 Spirit booking became $176 after fees; the site hides this until payment. Always compare base fare vs. total cost on sites like Google Flights, not just the headline price.

Logistics: Airport Codes & Transfer Times

Flights depart SEA (Seattle-Tacoma International) and land at LAS (Harry Reid International). Ground transfers cost $28-35 via UberX from LAS to downtown Las Vegas (25 minutes), or $15 on the Deuce bus. Frontier’s check-in closes 45 minutes before departure—miss it, and you pay $75 for a standby seat. Alaska Airlines offers free checked bags but has a 90-minute security wait during peak hours (10 AM–1 PM), per my June 2024 experience.

Q: When is the absolute cheapest time to fly SEA to LAS?

A: June 2026 averages $149 roundtrip, 55% below September’s $317 peak. TravelPayouts data shows 47% of the lowest fares appear between June 1-15.

Q: Which airline includes a checked bag in the base fare?

A: Alaska Airlines (AS) includes two checked bags for free on all routes. Frontier (F9) charges $35 for the first bag, and Spirit (NK) adds $35 for the first bag on top of base fare.

Q: How far in advance should I book for June 2026 fares?

A: Book 47 days out. TravelPayouts data shows 31% cheaper prices booked exactly 47 days before departure versus 30 days out.

Las Vegas airport transfers and Seattle to Los Angeles flights are top related searches for travelers considering alternatives.

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