How to Pay Your Southwest Gas Bill Online and by Phone

Southwest Gas Bill Pay: The Basics

Southwest Gas is a utility company that serves parts of Arizona, Nevada, and California. You can pay your bill through their website, mobile app, by phone, or by mail. Most customers use the online portal or app because payments post the same day if you pay before the cutoff time — usually around 5 p.m. Pacific Time on business days.

You do not need to set up anything special to make a one-time payment. You just need your account number (on your bill) and a checking account, savings account, or debit card. If you want automatic payments each month, Southwest Gas calls this Budget Billing or AutoPay, and you set that up separately.

Key Takeaways

• You can pay your Southwest Gas bill online at swgas.com, through their mobile app, by phone at 1-877-411-7427, or by mailing a check to the address on your bill.
• One-time online or app payments post the same day if submitted before 5 p.m. Pacific Time on a business day, and there is no fee for paying from a bank account.
• Automatic monthly payments (AutoPay) require you to enroll through your account and can be set to deduct from your checking or savings account on a date you choose.
• If you pay by debit or credit card online or by phone, Southwest Gas charges a convenience fee that varies depending on the payment method.

Paying Online or Through the Mobile App

Log in to your Southwest Gas account at swgas.com using your account number and password. If you do not have a login yet, you can create one on the homepage. Once you are logged in, look for a button labeled "Pay Now" or "Make a Payment." Enter the amount you want to pay and choose your payment method.

If you pay from a checking or savings account, there is no fee. If you use a debit or credit card, Southwest Gas charges a convenience fee — the amount depends on whether you use a Visa, Mastercard, American Express, or Discover card. The fee will be shown to you before you confirm the payment, so you can see the total cost.

The mobile app works the same way. read the Southwest Gas app on your phone, log in with the same account credentials, and select "Pay My Bill." You can save your bank account or card information in the app so you do not have to enter it every time.

Paying by Phone

Call Southwest Gas at 1-877-411-7427. A representative will ask for your account number and the amount you want to pay. You can pay from a bank account or a debit or credit card over the phone. Like online payments, bank account payments have no fee, but card payments include a convenience charge.

Phone payments are processed during business hours, Monday through Friday. If you call outside business hours, your payment will be queued and processed the next business day. Ask the representative for a confirmation number before you hang up.

Setting Up Automatic Monthly Payments

Automatic payments (AutoPay) deduct money from your bank account on the same date each month. To enroll, log into your Southwest Gas account online, go to "Billing & Payment," and select "AutoPay." You will need to provide your checking or savings account number and routing number. There is no fee for AutoPay payments from a bank account.

You can choose the date the payment comes out each month — for example, the 15th or the 1st. If that date falls on a weekend or holiday, the payment will process on the next business day. You can change or cancel AutoPay at any time through your account.

If you want to pay a fixed amount each month (even if your bill varies), Southwest Gas offers Budget Billing. This averages your annual usage and charges you the same amount each month, so your bill is more predictable. You still set this up through your account online.

Paying by Mail

Write a check or money order and mail it to the address printed on your bill. Do not send cash. Include your account number on the check so Southwest Gas can match the payment to your account. Mail typically takes 5 to 10 business days to arrive, so send it early if your due date is coming up.

Southwest Gas processes mailed payments when they arrive, not when you send them. If your payment arrives after the due date, you may be charged a late fee. For this reason, most customers prefer online or phone payments, which post the same day.

What Happens If You Miss a Payment

If your bill is not paid by the due date, Southwest Gas will charge a late fee. The amount varies by state and account type. After 30 days past due, Southwest Gas may send a notice warning that service could be disconnected. If the bill remains unpaid for 60 days, the company can shut off your gas.

If you are having trouble paying your bill, contact Southwest Gas before the due date. They may offer a payment plan that lets you spread the cost over several months. Some areas also have utility information programs that help low-income households pay their bills — your local community action agency or 211 can tell you what is available in your area.

Convenience Fees and Payment Methods

Payment Method	Fee	Processing Time
Bank account (online, app, or phone)	None	Same day if before 5 p.m. PT
Debit or credit card (online or app)	Varies by card type	Same day if before 5 p.m. PT
Debit or credit card (phone)	Varies by card type	Same day if before 5 p.m. PT
AutoPay from bank account	None	On your chosen date each month
Check by mail	None	5–10 business days

Frequently Asked Questions

Can I pay my Southwest Gas bill with a credit card without a fee?

No. Southwest Gas charges a convenience fee for all credit card payments, whether you pay online, through the app, or by phone. The fee amount depends on your card type. Paying from a bank account or by check has no fee.

What time do I need to pay by to have it post the same day?

Online and app payments must be submitted before 5 p.m. Pacific Time on a business day to post the same day. Phone payments during business hours also post the same day. Payments made after 5 p.m. or on weekends will process the next business day.

Can I change or cancel AutoPay?

Yes. Log into your Southwest Gas account, go to "Billing & Payment," and select "AutoPay" to change the amount, date, or payment method, or to cancel it entirely. Changes take effect on your next billing cycle.

What should I do if my payment did not go through?

Check your Southwest Gas account online to see if the payment posted. If it did not, try paying again using a different method — for example, switch from a card to a bank account. If the problem continues, call 1-877-411-7427 to speak with a representative.

Is there a way to avoid late fees if I cannot pay on time?

Contact Southwest Gas before your due date to ask about a payment plan. They may allow you to split your bill into smaller payments over several months. Some states and counties also have utility information programs that can help cover your bill if you meet income requirements.