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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.
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