Where and how to pay Southwest Gas
Southwest Gas Corporation accepts payments through several channels, and the fastest route depends on whether you want to pay right now or set up automatic payments. You can pay online through their website, by phone, by mail, or in person at a payment location — each method takes a different amount of time and carries different fees.
The online portal at swgas.com is the quickest option if you already have your account number. You log in, enter a payment amount, and choose your payment date. Phone payments go through their customer service line at 1-877-860-6020, where a representative takes your information over the phone. Mail payments take 7 to 10 business days to reach Southwest Gas, so plan ahead if your bill is due soon. In-person payments are available at authorized payment locations, though these vary by region.
Automatic payments (sometimes called budget billing or equal monthly payments) deduct a set amount from your bank account on the same day each month. This removes the need to remember to pay, but you still receive a bill showing your actual usage — the automatic payment just covers part or all of it depending on your setup.
Key Takeaways
- Online payment through swgas.com is the fastest method and requires only your account number and a bank account or debit card.
- Phone payments at 1-877-860-6020 take a few minutes but require you to speak with a representative and provide payment information verbally.
- Mail payments take 7 to 10 business days to arrive, so send them at least two weeks before your due date to avoid a late fee.
- Automatic payments remove the need to pay manually each month, but you should still review your bill to catch billing errors or unusual usage.
- Some payment methods may charge a convenience fee, so check the fee amount before you confirm a payment.
Setting up automatic payments with Southwest Gas
Automatic payments are set up through your online account at swgas.com. Log in, go to the billing section, and look for the option to enroll in automatic payments or budget billing. You will need to provide your bank account number and routing number, or a debit or credit card number. Southwest Gas will ask you to choose a payment day — most customers pick the same day their paycheck arrives or the day before their bill is due.
Once automatic payments are active, Southwest Gas deducts the amount on your chosen day each month. You still receive a bill in the mail or by email showing your actual gas usage and charges. If your usage changes — for example, if you use more gas in winter — your automatic payment amount may not cover the full bill, and you will owe the difference. You can adjust the payment amount anytime through your account.
Automatic payments do not lock you into a contract. You can stop them at any time by logging into your account or calling customer service. If you stop automatic payments, you go back to paying manually, and you are responsible for making sure each payment arrives by the due date.
Understanding payment due dates and late fees
Your bill shows a due date, usually 15 to 20 days after the bill is issued. If your payment does not arrive by that date, Southwest Gas charges a late fee. The late fee amount varies by state and by your account balance, so check your bill or call customer service to learn what late fee applies to you.
If you pay by mail, count backwards from the due date by at least 10 business days to give the payment time to arrive. A check mailed on the due date itself will almost certainly arrive late. Online and phone payments post immediately or within one business day, so they are safer if you are close to the deadline.
If you miss a payment, Southwest Gas may suspend your service after 10 to 15 days of non-payment, depending on your state. Reconnection requires a reconnection fee on top of the overdue balance. If you know you cannot pay by the due date, call customer service before the deadline — some regions offer short payment extensions or hardship programs for customers facing temporary difficulty.
Paying online through your Southwest Gas account
To pay online, go to swgas.com and click the "Pay My Bill" or "Make a Payment" link on the homepage. You will need your account number, which appears on your bill or in any past correspondence from Southwest Gas. If you do not have an account number, you can look it up using your phone number or service address.
Once you log in, the system shows your current balance and lets you choose how much to pay. You can pay the full amount due, a partial payment, or a different amount. Next, you choose your payment method — bank account (which is usually free) or debit or credit card (which may charge a convenience fee). Enter the payment date you want, and the system confirms the transaction.
Online payments from a bank account typically post within one business day and carry no fee. Debit and credit card payments post faster but usually charge a 2 to 3 percent convenience fee. If you are paying close to the due date, choose the fastest method available, which is usually a debit card payment.
Paying by phone or mail
Phone payments go through Southwest Gas customer service at 1-877-860-6020. A representative will ask for your account number, the amount you want to pay, and your payment method (bank account or card). The call takes about 5 minutes. Phone payments from a bank account are usually free, but card payments may carry a convenience fee. Ask the representative about the fee before you confirm the payment.
Mail payments should be sent to the address shown on your bill. Write your account number on the check or money order, and mail it at least 10 business days before the due date. Southwest Gas applies mail payments to your account when they receive them, not when you send them, so a check that arrives on the due date is considered late. Keep a copy of the check or the envelope for your records.
Both phone and mail payments take longer to process than online payments. If your bill is due in the next few days, phone or mail is risky — use online payment instead.
What to do if you cannot pay your full bill
If you cannot pay the full amount by the due date, contact Southwest Gas before the deadline. Call 1-877-860-6020 and explain your situation. Some regions offer short-term payment extensions (usually 10 to 30 days) or budget billing plans that spread your balance over several months. You may also be referred to a hardship program if you are facing a temporary financial crisis.
Partial payments are accepted, but they do not stop late fees from being charged on the unpaid balance. If you pay half your bill on time and half late, you still owe the late fee on the half that was late. For this reason, it is better to contact customer service and ask about a formal extension or payment plan than to send a partial payment and hope the late fee is waived.
If your service is disconnected due to non-payment, you will need to pay the full overdue balance plus a reconnection fee to restore service. Reconnection can take 24 to 48 hours, so it is worth calling before you reach that point.
Checking your payment history and account balance
Log into your Southwest Gas account at swgas.com to see your current balance, past payments, and upcoming bills. The account page shows the date each payment was received and the amount. If you do not see a recent payment, it may still be processing — online payments typically post within one business day, and mail payments take 7 to 10 days.
Your account also shows your billing history for the past 12 to 24 months, which is useful if you want to compare your current bill to past months. If you notice an unusually high bill, you can check your usage history to see whether you used more gas than usual or whether the bill itself contains an error. If you spot a mistake, contact customer service to report it.
You can also set up bill notifications through your account. Southwest Gas can send you an email or text message when your bill is ready, when a payment is due, or when an automatic payment has been processed. These notifications help you stay on top of your bill and catch problems early.
Frequently Asked Questions
Is there a fee to pay my Southwest Gas bill online?
Payments from a bank account are free. Payments by debit or credit card usually charge a 2 to 3 percent convenience fee. Phone and mail payments from a bank account are also free. Check the fee amount on the payment screen before you confirm the transaction.
How long does it take for an online payment to show up on my account?
Online payments from a bank account typically post within one business day. Debit and credit card payments may post faster, sometimes within a few hours. Mail payments take 7 to 10 business days. If you are paying close to the due date, use online payment to avoid a late fee.
Can I change my automatic payment amount or date?
Yes. Log into your account at swgas.com, go to the automatic payment section, and update the amount or date. Changes usually take effect on your next scheduled payment. You can also stop automatic payments anytime through your account or by calling customer service.
What happens if I pay late?
Southwest Gas charges a late fee on any balance not paid by the due date. If you remain unpaid for 10 to 15 days, your service may be disconnected. You will then owe the overdue balance, the late fee, and a reconnection fee to restore service.
Can I pay someone else's Southwest Gas bill?
Yes, if you have their account number. You can pay online, by phone, or by mail using their account number. The payment will be applied to their account. If you are paying for someone else regularly, ask Southwest Gas about adding yourself as an authorized payer on their account.