Southwest does offer payment plans, but only for specific purchases
Southwest Airlines lets you split the cost of a flight ticket across multiple payments through Affirm, a buy-now-pay-later service. You can also use a credit card's own payment plan if your card issuer offers one. However, Southwest does not let you pay for a ticket in installments directly through the airline—the payment plan has to come from a third party or your bank.
The Affirm option appears at checkout when you book a flight on Southwest's website or app. You choose how many payments you want to make (typically 3, 6, or 12 months), see the interest rate upfront, and decide whether to proceed. If you're approved, Affirm pays Southwest immediately, and you pay Affirm on the schedule you chose.
Key Takeaways
- Southwest offers Affirm as a payment plan option at checkout, letting you split ticket costs into 3, 6, or 12 monthly payments.
- Affirm charges interest unless you may have access to for a 0% promotional period, which varies by purchase amount and your credit profile.
- You must be approved by Affirm before the payment plan takes effect; approval is not may provide and depends on your credit history.
- If your credit card issuer offers a payment plan, you can use that instead, but you'll need to check your card's terms directly.
- Changing or canceling a payment plan after approval is difficult; contact Affirm or your card issuer immediately if your plans change.
How Affirm works when you book a Southwest flight
When you reach the payment screen during checkout, Affirm appears as one of your payment options. You select it, enter your personal information, and Affirm runs a soft credit check—this does not hurt your credit score. Within seconds, you'll see whether you're approved and what interest rate you'll pay.
If approved, you choose your payment schedule. A $300 ticket might be split into three $100 payments, six $50 payments, or twelve $25 payments. Affirm shows you the total interest you'll pay upfront so there are no surprises. Once you confirm, Affirm pays Southwest the full ticket price immediately, and your flight is booked. You then owe Affirm, not Southwest.
Payments are due on the same day each month. If you miss a payment, Affirm charges a late fee and reports it to the credit bureaus, which can lower your credit score. Set up automatic payments from your bank account to avoid this.
Interest rates and when you might pay nothing extra
Affirm sometimes offers 0% interest for certain purchase amounts or customer profiles. These promotions change frequently and depend on the merchant, the purchase size, and your credit history. When you're at checkout, Affirm tells you exactly what rate applies to your transaction—there's no guessing.
If you don't may have access to for 0%, interest rates typically range from 10% to 30% annually, though the exact rate depends on your credit score and the length of your payment plan. A longer plan (12 months) usually carries a lower rate than a shorter one (3 months), but you pay interest for longer, so the total cost may be higher.
Before you accept an Affirm plan, do the math. A $400 flight split into 12 payments at 20% interest costs roughly $42 extra. If you can pay the full price now with a credit card that earns rewards, that might be cheaper than the interest you'd pay to Affirm.
What happens if you need to cancel your flight
Southwest's refund policy and your Affirm payment plan are separate. If you cancel your Southwest flight and get a refund, that refund goes to Affirm, not to you. Affirm then credits your account, and you stop owing them money. However, if Southwest issues a travel credit instead of a cash refund, you'll still owe Affirm the full amount even though you didn't get cash back.
Read Southwest's cancellation policy before you book. If you think you might need to cancel, paying the full price upfront with a credit card (which you can dispute if needed) may be safer than locking into an Affirm plan.
Using your credit card's payment plan instead
Some credit card issuers offer their own payment plans, sometimes called "pay over time" or "installment plans." These let you split a purchase into equal monthly payments, often at 0% interest for a set period. If your card offers this, you can use it to pay for a Southwest ticket instead of Affirm.
To find out whether your card has this feature, log into your card's app or website and look for a "pay over time" or "installment" option. Not all cards offer it, and not all merchants accept it. Call your card issuer if you're unsure. If your card does offer it, you can usually set up the plan after you've made the purchase, which gives you more flexibility than Affirm (where you choose the plan at checkout).
When Southwest payment plans are not available
Affirm is available only when you book directly on Southwest's website or mobile app. If you book through a third-party travel site, Affirm won't appear as an option. In that case, you'd need to use your credit card's own payment plan or pay the full price upfront.
Affirm also may not be available for certain ticket types, such as group bookings or tickets purchased with a gift card. If you don't see Affirm at checkout, it's not available for that particular transaction.
What to do if you're denied by Affirm
If Affirm denies you, it means their credit check found a risk they're not willing to take. This could be due to a low credit score, recent missed payments, or too much existing debt. Denial doesn't affect your credit score (the check was soft), but it does mean you can't use Affirm for that purchase.
Your options are to pay the full ticket price upfront with a debit card or credit card, or to wait and apply again later if your credit situation improves. You can also try a different payment method—for example, if your credit card issuer offers a payment plan, use that instead.
Frequently Asked Questions
Can I change my Affirm payment plan after I've booked my flight?
No. Once Affirm approves your plan and pays Southwest, the schedule is locked in. If your circumstances change, contact Affirm immediately to discuss your options. In some cases, they may let you pause a payment or refinance, but this is not may provide and depends on your account status.
What if I pay off my Affirm plan early?
You can pay off the full remaining balance at any time without penalty. Log into your Affirm account, select the payment plan, and choose to pay in full. This stops the interest from accruing on future months, though you'll still owe interest on the months already passed.
Does using Affirm hurt my credit score?
The initial approval check does not hurt your score. However, Affirm reports your payment history to the credit bureaus, so missing payments will lower your score. Paying on time actually helps your credit by showing you manage installment debt responsibly.
Can I use Affirm to pay for a Southwest gift card?
No. Affirm is available only for flight tickets, not for gift cards or other Southwest purchases. If you want to split the cost of a gift card, use your credit card's payment plan if it offers one.
What if my flight is refunded as a travel credit instead of cash?
You'll still owe Affirm the full amount even though you received a credit instead of cash. The credit sits in your Southwest account until you book another flight. This is why it's important to understand Southwest's refund policy before you commit to an Affirm plan.