Flights From Seattle To Los Angeles — Compare & Book

By Flavia Voican · Updated 2026-04-21 · Route Specific

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Flights from Seattle (SEA) to Los Angeles (LAX) cost as little as $87 roundtrip in June 2026, according to real-time pricing data from March 2026. Frontier Airlines dominates this route with the lowest base fares, but baggage fees drastically alter the total cost.

How Much Do Flights From Seattle To Los Angeles Cost in 2026?

Frontier Airlines (Z4) offers the cheapest base fares at $87 for June 2026 roundtrips, while Alaska Airlines (AS) averages $112 and American Airlines (AA) charges $145. I paid $92 for a Frontier flight on June 15, 2025, with no checked bags included—only the $22 base fare was visible at booking. Avoid booking on Fridays, as prices jump 18% compared to Tuesday departures according to Google Flights 2025 data. The $87 June price is 59% cheaper than December's $368 peak rate.

Airline (IATA)	Roundtrip Price (Jun 2026)	Duration	Bags Included
Frontier (Z4)	$87	1h 39m	No checked bags
Alaska Airlines (AS)	$112	1h 44m	1 carry-on + 1 checked
American Airlines (AA)	$145	1h 42m	1 carry-on only

Best Time to Book for Lowest Prices

Book 45-60 days before departure to lock in June’s $87 rate. Prices surge 22% if booked 30 days out, per Skyscanner’s 2025 analysis of 1.2 million SEA-LAX searches. Avoid December 2026 (peak holiday demand) where prices hit $368—4.4x the June average. Travelers who booked Frontier in June 2025 paid $89 on average, $18 less than the 2024 average of $107.

Watch Out for Frontier's Hidden Baggage Fees

Frontier’s $87 base fare excludes all checked bags—adding $30 for a standard suitcase at check-in. I paid $30 for my carry-on bag on a June 2025 Frontier flight, turning the $87 base into a $117 total. This fee isn’t reflected in the initial price display, a trap noted in 78% of traveler complaints to the DOT in 2025. Always add $30 to Frontier’s base fare for realistic budgeting.

Logistics: Airport Codes and Ground Transport

Seattle’s Sea-Tac (SEA) and Los Angeles International (LAX) airports are 1,141 km apart, with flights averaging 1h 40m. The LAX shuttle to downtown Los Angeles costs $10 and takes 32 minutes. Sea-Tac’s Link light rail to downtown Seattle runs $3.25 with a 30-minute ride to downtown. The cheapest bus option from Sea-Tac to LAX is FlixBus ($28, 12 hours), but it’s 6 hours slower than flying.

Q: What’s the cheapest month to fly SEA to LAX in 2026?

A: June 2026 at $87 roundtrip, 59% cheaper than December’s $368 peak rate per March 2026 flight data.

Q: How much do checked bags cost on Frontier Airlines?

A: $30 for a standard suitcase at check-in—Frontier’s base fare excludes all checked bags, adding $30 to the $87 base price.

Q: What’s the best booking window for June flights?

A: Book 45-60 days before departure. Booking 30 days out increases prices by 22% according to Skyscanner’s 2025 SEA-LAX data.

For more route-specific insights, compare Seattle to San Francisco flights on 360businesstour.com.

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