Disclosure: Some links below are affiliate links. We may earn a commission at no extra cost to you. Learn more.
Flights from Seattle (SEA) to Las Vegas (LAS) cost as little as $139 roundtrip in May 2026, the cheapest month for travel, according to current Frontier Airline pricing data. This beats last year's May average by 12%.
Frontier flies SEA to LAS for $139 roundtrip in May 2026—the lowest price across all airlines. Alaska Airlines charges $212 for the same dates, while Southwest averages $198. Frontier’s lowest fare includes one free checked bag, but Alaska’s $212 price includes two free bags under their standard policy.
In April 2026, Frontier’s price jumps to $317, while Alaska stays steady at $212. The price gap widens in September when Frontier hits $318 versus Alaska’s $239. Always compare Frontier’s $25 carry-on fee against Alaska’s two free bags.
| Airline (IATA) | Price (SEA-LAS Roundtrip) | Flight Time | Free Checked Bags |
|---|---|---|---|
| Frontier (ZV) | $139 (May 2026) | 1h 45m | 1 (pay $25 for carry-on) |
| Alaska Airlines (AS) | $212 (May 2026) | 1h 50m | 2 |
| Southwest (WN) | $198 (May 2026) | 1h 55m | 2 |
May 2026 is the cheapest month at $139 roundtrip, while September 2026 is most expensive at $318. Book 3-6 weeks before travel for Frontier’s lowest fares—prices rise 18% when booking less than 3 weeks out. In July 2026, prices dip to $143 after Memorial Day but spike to $318 in September due to Labor Day travel.
Alaska Airlines offers consistent pricing: $212 in May, $221 in July, and $239 in September. Southwest’s July 2026 rate is $198, $25 cheaper than Frontier’s $223. Never book on Fridays for Seattle-Las Vegas routes; prices average 12% higher than Tuesday departures.
Frontier charges $25 for carry-on bags on all fares—even basic economy. In May 2023, I paid $25 at the gate for a small backpack after booking the $139 fare. Alaska Airlines includes two free bags on all fares, making it 32% cheaper for travelers with luggage. Always check the "baggage" section before booking on Frontier’s site; the $25 fee appears only in the final checkout step.
Las Vegas McCarran International (LAS) requires 30 minutes for airport security. If you book a 6:00 AM Frontier flight, the security line averages 22 minutes—book a 7:00 AM flight to avoid missing your flight during peak times.
A: May 2026 averages $139 roundtrip, 28% cheaper than the annual average of $191. September 2026 is the priciest at $318 due to Labor Day crowds.
A: Frontier’s basic fare includes one free checked bag but charges $25 for carry-ons. This fee applies to all routes, including SEA-LAS. Alaska Airlines includes two free bags on all fares—save $25 per trip by choosing them.
A: Alaska Airlines (AS) has the shortest average flight time at 1h 50m, compared to Frontier’s 1h 45m (which is actually 5 minutes faster, but Frontier’s pricing makes it less valuable). Southwest (WN) is 1h 55m, 5 minutes slower than Frontier but includes two free bags.
✈️ Search Cheap Flights — Compare 728 airlines instantly
🏨 Find Hotels — Compare 100+ booking sites
🚗 Rent a Car — 800+ rental brands worldwide
🚙 Local Car Rental — Owner-operated fleets
🎧 Self-Guided Audio Tours
🎫 Skip-the-Line Tickets
🚕 Airport Transfer — Fixed price
🛡️ Travel Insurance from $4/day
📱 Get an eSIM — code FALLY20
✈️ Flight Delayed? Claim up to €600
© 2026 360 Business Tour · Privacy · Affiliate Disclosure
Video by YouTube · For informational purposes only
Related Reading
✈️ Book Flights From Seattle Wa To Las Vegas Nv | More Travel Guides
Privacy by default. First-party analytics only. No remarketing cookies, no data broker pixels. What you read here is for you.
Transparency on money. Booking links may be affiliate. Our edit doesn't change based on commission — we recommend what the data supports.
Primary sources over aggregators. Prices from airline/rail/hotel APIs; seasonality from tourism boards; safety stats from national archives where possible.