How does the Southwest boarding algorithm work?

A Southwest boarding pass position consists of a letter, which can be A, B, or C, and a number between 1 and 60. The boarding process starts with preboarding, for people with disabilities. Boarding starts with A1, then A2, then A3… and so on until A60. Then there is Family Boarding, to allow families to sit together.



The Southwest Airlines boarding "algorithm" is actually a transparent, time-based system that prioritizes passengers based on when they check in and their fare class. The process begins exactly 36 hours before departure for "EarlyBird Check-In" users and 24 hours before departure for everyone else. The system assigns a boarding position (A, B, or C, followed by a number 1-60) in the order that check-ins are received. However, there is a "priority hierarchy" that the algorithm follows: first, Business Select passengers are automatically assigned positions A1-A15. Then, A-List and A-List Preferred members are assigned positions, followed by those who purchased EarlyBird. Finally, general passengers are assigned spots based on the millisecond they tap "Check In" on their app exactly 24 hours out. In 2026, while Southwest has introduced assigned seating on some routes, the "classic" boarding still relies on this rapid-fire check-in logic. If you aren't an elite member or a "Business Select" buyer, the algorithm essentially rewards those with the fastest fingers, making the "24-hour-mark" check-in a high-stakes ritual for travelers wanting to avoid the dreaded middle seat in the "C" group.

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If you check in exactly 24 hours ahead of time, you'll usually end up somewhere in the B group. If you have a B group boarding position, the chances are good that you'll still be able to get a window or aisle seat or find 2 seats together if you're traveling with a companion.

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Southwest follows an open seating style, meaning there are no assigned seats. You'll be assigned a boarding group (either A, B, or C) and position (1-60+) upon check-in, which determines your boarding order. Once on board, you choose your seat. If you're last to board, you likely won't get to sit with your family.

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A-List positions are automatically assigned beginning 36 hours prior to departure. If an A-Lister receives a position in the B or C group (happens when a flight change is made less than 36 hours before departure) they can board after the A group. Business Select fares guarantee an A1-15 boarding position.

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Purchase a Business Select fare or upgrade to Business Select: Customers who purchase a Business Select fare will get guaranteed A1-A15 boarding. If a Customer did not originally purchase a Business Select fare but wants guaranteed A1-A15 boarding, they can upgrade their flight to Business Select.

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Southwest Airlines does not assign seats. Rather, they have a fixed boarding order. People are assigned boarding positions in order of check in and fare status (higher fares and earlier check in lead to better positions). Each position consists of a letter and number.

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If you check in exactly 24 hours ahead of time, you'll usually end up somewhere in the B group. If you have a B group boarding position, the chances are good that you'll still be able to get a window or aisle seat or find 2 seats together if you're traveling with a companion.

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On Southwest it is an open seating policy meaning you can sit in any open seat. With B1 you should have no problem getting a window or aisle at mid cabin or towards the back of the plane.

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Southwest has three boarding groups, A, B, and C, and each group has 60 'positions. ' Upon checking in, you'll be assigned one of these 180 positions, determining when you can board and choose your seat.

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Check in early. No seats are assigned on Southwest Airlines, but boarding positions are assigned at check-in. The earlier you check in, the better position you will secure for yourself. Check-In begins 24 hours prior to your departure time.

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As such, we do not publish flight loads. If for any reason you're uncomfortable traveling in the current environment and would like to discuss the flight load of your upcoming flight, we strongly encourage you to reach out to our Customer Service Department via any of the options below. Email here.

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However, even in general boarding, there are clear queues: Group 5 (Preferred Boarding): Passengers in Main Cabin Extra seats (not on Basic Economy tickets), AAdvantage members who accrue 15,000 Loyalty Points (milestone benefit), and select AAdvantage co-brand card holders.

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At Southwest, we let you sit where you like. We don't assign seats on our flights, so feel free to sit in any available seat once you board the plane. We have a quick, easy, and efficient boarding process. Look at your boarding pass to find your assigned boarding group (A, B, or C) and boarding position (1 - 60).

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Purchase a Business Select fare or upgrade to Business Select: Customers who purchase a Business Select fare will get guaranteed A1-A15 boarding.

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There are two elite status levels: A-List and A-List Preferred. A-List is earned by taking 25 one-way flights or earning 35,000 tier-qualifying points. A-List Preferred is earned by flying 50 one-way flights or earning 70,000 tier-qualifying points. How do you become an A-lister on Southwest?

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An “A” or “F” mean first-class treatment, while a “B” often means you're more likely to get upgraded than if you have a “Q” or a “Y” on your ticket—the latter two are typically the cheapest economy fares.

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Additionally, you should strongly consider EarlyBird Check-In if you're pretty particular about your seat; while it doesn't guarantee A Group boarding, it certainly gives you a much better chance of nabbing your desired spot.

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United Airlines boarding groups recapped If boarding early is important to you, there are a number of ways you can secure early boarding. These include holding United Premier or Star Alliance status, carrying a qualifying United credit card, flying in a premium cabin or purchasing priority boarding on select flights.

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Yes, A45 is a very good number. No worries. There may be 44 people ahead of you but probably less.

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30 minutes prior to scheduled departure time: We may begin boarding as early as 30 minutes prior to your flight's scheduled departure time. We encourage all passengers to plan to arrive in the gate area no later than this time.

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Airlines will typically assign the earliest boarding groups to passengers who are the most loyal. Previously, this was dictated by how many miles one flew, but nowadays, it's usually how much one spends on tickets.

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