Yes, you absolutely can! I actually upgraded my Horizon Air seat just last month, and it was a pretty smooth process. I’d originally booked a basic seat through the Alaska Airlines site (since Horizon operates under Alaska), but later decided I wanted more legroom for the flight from Portland to Spokane. I logged into my account, went to “Manage Trip,” and saw the upgrade option right there. I chose a premium seat and paid the small fare difference—it updated instantly.
What’s nice is that if you booked through a travel site like Expedia, you can still modify or upgrade by calling the airline’s customer support or using the online manage-booking tool. I’ve learned that doing it early gives you more seat choices. And if you ever need to cancel or rebook, the same “Manage Trip” section works great—it’s fast, easy, and updates your reservation in real-time.
