To find the cheapest days to fly with Alaska Airlines, focus on mid-week travel, particularly Tuesdays and Wednesdays. These days usually feature lower fares due to reduced demand. Off-peak travel seasons, like late winter or early spring, also tend to offer more affordable options. 

Look for early morning or late-night flights, as these times often have lower prices. Booking at least three weeks in advance is crucial for snagging the best deals, and setting up fare alerts can help you catch price drops for your desired routes. 

Keep an eye on Alaska Airlines’ special promotions and flash sales, which can provide substantial savings. Flexibility with your travel dates is key; even a small shift in your schedule can result in better fares. Additionally, consider utilizing Alaska's frequent flyer program, Mileage Plan, to earn points and enjoy discounts on future flights. Always compare prices across different days and times for the best possible deals.