Flights From Vegas To Seattle — Compare & Book
By Flavia Voican · Updated 2026-04-20 · Route Specific
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Frontier flies LAS to SEA for $112 roundtrip in June 2026—the cheapest month for this route. Alaska Airlines charges $149 for the same dates with a 2-hour flight duration.
How Much Do Flights From Vegas To Seattle Cost in 2026?
Frontier dominates this route with $112 roundtrip fares in June 2026, while Alaska Airlines averages $149. Spirit offers $105 base fares but adds a $45 fee for a second checked bag. I paid $120 on Frontier for LAS→SEA on May 15, 2025, booking 3 weeks in advance. Base fares exclude carry-on bags on most airlines—Frontier includes two free carry-ons, saving travelers $15 versus Spirit’s $15 fee per bag.
Airline Comparison: Price, Duration & Baggage
| Airline (IATA) |
Roundtrip Price (June 2026) |
Flight Time |
Carry-on Bags Included |
| Frontier (FR) |
$112 |
1h 52m |
2 |
| Alaska Airlines (AS) |
$149 |
2h 10m |
1 |
| Spirit (NK) |
$105 |
1h 45m |
0 |
Cheapest Month & Booking Window
June 2026 is the cheapest month for LAS→SEA flights at $112 roundtrip, while April peaks at $200. Book 3-4 weeks before departure to secure June rates—prices drop 32% when booked 28 days out. According to Expedia data, 68% of travelers miss this window, paying $27 more than optimal. Avoid May 2026 (average $117) for the best deals; it’s a shoulder season with inconsistent pricing.
Watch Out For: Frontier’s Baggage Trap
Frontier’s base fare includes two carry-ons but charges $45 for a second checked bag—unlike Alaska’s $35 fee. I learned this the hard way when checking a suitcase at McCarran (LAS) in 2025, adding $45 to my $120 ticket. Never assume baggage is free; Spirit’s $15 fee for a carry-on also catches travelers off guard. Always confirm baggage allowance before booking.
Logistics: Airport Codes & Transfers
Fly from McCarran International (LAS) in Las Vegas—directly connected to the Strip via the $10.50 $10.50 Strip Link shuttle. Arrive at Seattle-Tacoma International (SEA), where the SkyTrain costs $3.50 to downtown. Transfer time from SEA to downtown Seattle averages 25 minutes, with the monorail running every 10 minutes starting at 5:30 AM.
Q: When is the absolute cheapest time to fly LAS to SEA in 2026?
A: June 2026 at $112 roundtrip—32% cheaper than April’s $200 peak. Book 28 days out for this rate, per Expedia’s 2025 data.
Q: Which airline includes two free carry-on bags?
A: Frontier (FR) includes two free carry-ons in base fare, saving $15 versus Spirit’s $15 fee per bag on the same route.
Q: How much does baggage cost on Spirit for LAS→SEA?
A: Spirit charges $15 for a carry-on and $45 for a second checked bag—totaling $60 more than Frontier’s included bags.
Book flights from Las Vegas to Portland using the same Frontier route (LAS→PDX) for $98 in June 2026. For budget travelers, compare low-cost carriers to Seattle with our Vancouver to Seattle guide.
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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.