There are several ways to get a cheap flight to Alaska, including the following:

Book in advance: The earlier you book your flight, the more likely you are to find a good deal. Try to book at least a few months in advance to take advantage of early bird prices.

Compare prices: Use a flight comparison website such as Kayak, Expedia, or Google Flights to compare prices from different airlines. This will help you find the cheapest flight available.

Be flexible with your travel dates: If you're able to be flexible with your travel dates, you'll be more likely to find a cheap flight. Try to avoid traveling during peak season, which is typically June through August, and instead opt for a shoulder season trip in May or September.

Look for deals and discounts: Keep an eye out for deals and discounts on flights to Alaska. Airlines often offer sales or discounts for flights to Alaska, so make sure to check their websites regularly.

Consider alternative airports: Consider flying into alternative airports such as Seattle or Portland instead of Anchorage. These airports may have more flight options and cheaper prices.

Book a package deal: Consider booking a package deal that includes your flight, hotel, and rental car. These deals can often be cheaper than booking everything separately.

Use reward points or miles: Use your reward points or miles to book a flight to Alaska. Many airlines have partnerships with credit card companies, allowing you to earn points or miles for purchases.

Don't forget about budget airlines: Some budget airlines, such as Frontier and Spirit, also fly to Alaska, so make sure to check their prices as well.

Overall, with a bit of research and flexibility, you can find a cheap flight to Alaska. The key is to start planning early and to keep an eye out for deals and discounts. Also, consider alternative airports and alternative travel dates.