Quick Answer
Alaska Airlines is the clear winner - SEA is their hub, cheapest UM fee ($50), and they dominate West Coast routes. Flight time is 2.5 hours. Search this route →
Airlines Flying Seattle to Los Angeles for UMs
| Airline | UM Ages | Fee (each way) | Nonstop? |
|---|---|---|---|
| Alaska | 5-12 | $50 | ✅ Yes (SEA hub - many daily) |
| Delta | 5-14 | $150 | ✅ Yes (SEA is Delta hub too) |
| Southwest | 5-11 | $100 | ✅ Yes |
| American | 5-14 | $150 | ✅ Yes |
| United | 5-14 | $150 | ✅ Yes |
| Spirit | 5-14 | $150 | ✅ Yes |
Best Airline for SEA-LAX UM Flights
Best Overall: Alaska Airlines
Alaska is the obvious choice for West Coast UM travel:
- Only $50/way - saves $200 round trip vs competitors
- SEA is their primary hub - most flight options
- Free meal on flights over 2 hours
- MVP Gold members get FREE UM service
- Excellent West Coast network
- Lanyard and wristband for tracking
For Ages 13-14: Delta
Alaska's mandatory UM service ends at 12. For teens 13-14:
- Delta accepts UMs through age 14
- SEA is also a Delta hub
- Sky Zone lounges available
West Coast Custody Route
SEA-LAX is one of the busiest West Coast custody routes:
- Same time zone: No jet lag complications
- Short flight: 2.5 hours is easy for kids
- Tons of options: 20+ daily nonstops between the carriers
- Alaska dominates: Their frequent flyer program is great for regular UM travelers
How to Book
- Alaska: 1-800-252-7522
- Delta: 1-800-325-8847
- Southwest: 1-800-435-9792
- American: 1-800-433-7300
- United: 1-800-864-8331
