To add baggage to your Alaska Airlines flight, you have a few options. If you have already booked your flight, you can add checked baggage during online check-in, which is available from 1 to 24 hours before your flight. You can easily pay for your checked baggage charges online with a credit or debit card and then bring your bags to the baggage-check location at the airport[1].
Alternatively, you can pay for checked baggage at the airport using a check-in kiosk or at any of Alaska Airlines‘ airport ticket counters[2]. If you have not yet booked your flight, you can include checked baggage when making your reservation.
The standard fee for checked bags is $30 for the first bag, $40 for the second, and $100 for the third[3]. Size and weight limits apply, with a maximum weight of 50 pounds and a maximum linear dimension of 62 inches (length + width + height) [4].
If you have an Alaska Airlines Visa credit card, you can enjoy the benefit of your first checked bag being free[3]. Elite-level Mileage Plan members and passengers confirmed in first class at check-in also get their first and second checked bags free[3]. Active duty military personnel and their dependents on travel orders are eligible for up to five free checked bags[3].
Citations:
[1] https://www.alaskaair.com/content/travel-info/at-the-airport/airport-check-in-options
[2] https://www.alaskaair.com/content/travel-info/baggage/checked-bags
[3] https://www.nerdwallet.com/article/travel/guide-to-alaska-airlines-baggage-and-other-fees
[4] https://financebuzz.com/alaska-airlines-baggage-fees