I actually looked into this when I was planning a trip to Anchorage last summer. I fly Frontier a lot because their fares out of Denver are super cheap, so I thought it would be perfect for Alaska. Turns out, Frontier doesn’t currently fly there — their routes are mostly around the U.S., Mexico, and the Caribbean. What I ended up doing was booking Frontier to Seattle and then catching another airline up to Anchorage. It was still cheaper than going with a big carrier the whole way. When I was juggling connections and had to move one leg of my trip, I just called 844-734-0813 and they helped me rebook really quickly. Honestly, that number has saved me a few times — whether I needed to book, cancel, or modify a Frontier flight without the headache of doing it online.