Southwest Gas bill pay basics
Southwest Gas is a natural gas utility serving parts of Arizona, Nevada, and California. You can pay your bill through their website, mobile app, by phone, or by mail — and most methods let you set up automatic payments so you never have to think about it again.
The company does not charge a fee for paying online or through their app, which makes those the cheapest routes. Phone payments and in-person payments at a payment center also have no fee. If you mail a check, the only cost is postage.
Your bill arrives by mail or email depending on what you chose when you set up your account. The due date is usually about 20 days after the bill date, and late fees start if you miss it. Knowing your account number (found on your bill) and having your bank details ready will speed up whichever method you pick.
Key Takeaways
- Southwest Gas offers free online and app-based bill pay with no fees, making these the most affordable options.
- You can set up automatic payments through their website or app so your bill is paid on the same day each month without action from you.
- Phone payments are available 24/7 by calling 1-702-671-3333 (Nevada and California) or 1-602-371-3333 (Arizona), and there is no fee.
- If you pay in person at a Southwest Gas payment center, bring your account number and a payment method — cash, check, or card.
- Late payments trigger a fee and may result in service disconnection, so setting up autopay removes that risk entirely.
Paying online through the Southwest Gas website
Go to swgas.com and look for the "Pay My Bill" button, usually near the top of the page. You will need to log in with your account number and password, or create a login if this is your first time.
Once logged in, your current bill amount appears on the screen. You can choose to pay the full amount, a partial amount, or a past-due balance. Enter your bank account details (routing number and account number) or credit card information. Southwest Gas accepts Visa, Mastercard, American Express, and Discover, though paying by bank account transfer is free while card payments may carry a small fee depending on your card issuer.
After you confirm the payment, you will see a confirmation number. Write it down or take a screenshot — you will need it if you ever need to dispute the transaction. The payment typically posts to your account within one to two business days.
Using the Southwest Gas mobile app
The Southwest Gas mobile app is available on both iOS and Android. read it, log in with your account credentials, and tap "Pay Bill" from the home screen. The process is identical to the website: select your payment amount, enter your bank or card details, and confirm.
The app also shows your usage history, lets you report a gas leak or outage, and sends you reminders before your bill is due. Many people find the app faster than the website on a phone, especially if you pay the same amount every month.
Setting up automatic payments
Automatic payments remove the risk of forgetting a due date. On the Southwest Gas website or app, go to "Billing" or "Account Settings" and select "Autopay" or "Automatic Payments." Choose the day of the month you want the payment to come out — many people pick the day after they get paid — and whether you want to pay the full bill amount or a set dollar amount each month.
You can change or cancel autopay anytime by logging back in and adjusting your settings. If your bill amount varies significantly month to month (which is common with heating in winter), you might set autopay to cover your average bill and then manually pay any difference when the actual bill arrives.
Paying by phone
Call 1-702-671-3333 if you are in Nevada or California, or 1-602-371-3333 if you are in Arizona. Both numbers are available 24 hours a day, seven days a week. Have your account number and bank account or card details ready.
An automated system will walk you through the payment steps, or you can press a button to speak to a representative. Phone payments post within one to two business days, the same as online payments. There is no fee for paying by phone.
Paying in person or by mail
Southwest Gas operates payment centers in Arizona, Nevada, and California where you can walk in and pay cash, check, or card. Find the nearest location on their website under "Payment Centers." Bring your account number and your payment method. In-person payments are processed when ready, so your account is credited the same day.
If you mail a payment, write your account number on the check and send it to the address printed on your bill. Mail payments take longer to arrive and clear — typically five to seven business days — so mail early if your due date is approaching. Do not send cash by mail.
What happens if you miss a payment
If your payment does not arrive by the due date, Southwest Gas charges a late fee. The amount varies but is typically a percentage of your bill. After 30 days past due, the company may send a disconnection notice, and service can be shut off if you do not pay within the timeframe stated in that notice.
If you are having trouble paying, contact Southwest Gas directly to discuss a payment plan or hardship program. They may be able to work with you rather than disconnect service. Setting up autopay is the simplest way to avoid this situation entirely.
Frequently Asked Questions
Can I pay my Southwest Gas bill with a credit card online?
Yes. Southwest Gas accepts Visa, Mastercard, American Express, and Discover on their website and app. Your card issuer may charge a fee for this transaction, so check with your bank first. Paying by bank account transfer is free.
How long does it take for an online payment to show up on my account?
Online and phone payments typically post within one to two business days. In-person payments at a payment center are credited the same day. Mail payments take five to seven business days or longer depending on postal delivery.
What if I want to change my autopay date or amount?
Log into your Southwest Gas account online or through the app, go to your autopay settings, and update the date or amount. Changes take effect on your next billing cycle. You can also cancel autopay anytime through the same menu.
Is there a fee for paying my bill online?
No fee for paying online or through the app if you use a bank account transfer. Credit card payments may have a small fee from your card issuer, not from Southwest Gas. Phone and in-person payments are also free.
What should I do if I think my payment didn't go through?
Log into your account and check your payment history — you should see the transaction listed with a confirmation number. If it is not there, call customer service at the number on your bill. Keep your confirmation number handy when you call.