| Alaska Airlines | 0.00 USD | Standard seat selection included; preferred seating may cost extra; at booking / manage trip; Not published | Main Cabin | All routes | — | Source (www.alaskaair.com) | Last verified: 2025-12-19 |
| Alaska Airlines | Varies USD | Preferred seats; fee varies by flight; at booking / manage trip; Not published | Main Cabin | All routes | — | Source (www.alaskaair.com) | Last verified: 2025-12-19 |
| JetBlue | 0.00 USD | Standard seat selection included; at booking; Not published | Blue / Blue Plus / Blue Extra | All routes | — | Source (www.jetblue.com) | Last verified: 2025-12-19 |
| JetBlue | Varies USD | Even More Space seats; fee varies by flight; at booking / manage trip; Not published | All fares | All routes | — | Source (www.jetblue.com) | Last verified: 2025-12-19 |
| Southwest Airlines | 0.00 USD | Open seating; no assigned seats; check-in / boarding; Not published | All fares | All routes | — | Source (www.southwest.com) | Last verified: 2025-12-19 |
| United Airlines | 15.00 USD | Advance seat assignment (starting price); at booking / manage trip; Not published | Basic Economy | Varies | — | Source (www.united.com) | Last verified: 2025-12-19 |
| United Airlines | From 29 to 299 USD | Economy Plus seating (per flight, per person); at booking / manage trip; Not published | Economy | Varies | — | Source (www.united.com) | Last verified: 2025-12-19 |
| United Airlines | 24.00 USD | Preferred seating (starting price); at booking / manage trip; Not published | Economy (non-Basic) | Varies | — | Source (www.united.com) | Last verified: 2025-12-19 |
| United Airlines | 136.00 USD | Preferred seating (starting price); at booking / manage trip; Not published | Basic Economy | Varies | — | Source (www.united.com) | Last verified: 2025-12-19 |