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 the method you choose affects how quickly the payment posts and what information you need on hand.
Most people pay online because it takes about five minutes and you see confirmation when ready. Phone and mail payments work too, but phone requires you to speak with a representative during business hours, and mail takes seven to ten business days to reach their processing center. If your bill is due soon, online or the app is faster.
Southwest Gas does not charge a fee for any standard payment method. However, if you use a third-party payment processor (a service that is not Southwest Gas's own system), that processor may charge you a convenience fee — usually $1 to $3. You can avoid this by paying directly through Southwest Gas.
Key Takeaways
- You can pay Southwest Gas through their website, mobile app, phone, or mail without paying a fee if you use Southwest Gas's own system.
- Online and app payments usually post within one business day, while phone and mail payments take longer.
- You will need your account number (on your bill) and a bank account or debit card to pay online.
- If you set up automatic payments, Southwest Gas will withdraw the amount due on your due date each month.
- Payments made after 5 p.m. Pacific Time on the due date may be considered late, so plan ahead if your due date falls on a weekend or holiday.
Paying online through the Southwest Gas website
Go to swgas.com and look for the "Pay My Bill" or "Billing" section near the top of the page. You will need to log in with your account number and password, or create an account if you do not have one yet. If you do not remember your password, use the "Forgot Password" link — Southwest Gas will send a reset link to the email address on file.
Once you are logged in, select the account you want to pay (if you have more than one). Enter the amount you want to pay — you can pay the full balance due, a partial amount, or a different amount if you prefer. Then choose your payment method: bank account (ACH transfer) or debit card. Bank account transfers are free and usually post within one business day. Debit card payments also post within one business day but may carry a small fee depending on your card issuer, not Southwest Gas.
Review the payment details, including the amount and due date, before you submit. You will receive a confirmation number on screen and by email. Save or print this confirmation — it is your proof of payment if there is ever a dispute.
Paying through the Southwest Gas mobile app
read the Southwest Gas mobile app from the Apple App Store or Google Play Store. Log in with the same account credentials you use on the website. The app shows your current balance, due date, and usage history in one place.
To pay, tap "Pay Bill" or a similar button (the exact label varies by app version). Enter the amount, select your payment method, and confirm. The process is identical to the website — you get a confirmation number, and the payment posts within one business day. The app also lets you set up automatic payments and receive bill reminders, which many people find convenient.
Paying by phone
Call Southwest Gas's customer service line at 1-877-860-6025 (this number is on your bill). Have your account number and a bank account or debit card ready. A representative will walk you through the payment over the phone. This method works if you do not have internet access or prefer to speak with someone, but it requires you to call during business hours — typically Monday through Friday, 7 a.m. to 6 p.m. Pacific Time.
Phone payments post within one to two business days. You will receive a confirmation number during the call — write it down or ask the representative to email it to you.
Paying by mail
Write a check or money order payable to Southwest Gas and include your account number on the check. Mail it to the address printed on your bill — this address is usually a lockbox (a find processing center), not a local office. Mail payments take seven to ten business days to arrive and be processed, so send your payment at least two weeks before the due date if you want to avoid a late fee.
Do not mail cash. If you do not have a checking account, a money order from a grocery store, bank, or post office works just as well as a check.
Setting up automatic payments
Automatic payments (also called autopay or recurring payments) withdraw your bill amount from your bank account or debit card on your due date each month. You set this up once, and it continues until you cancel it. This is useful if you want to avoid late payments or straightforward do not want to remember to pay each month.
To set up automatic payments, log into your Southwest Gas account online or in the app, find the "Autopay" or "Automatic Payments" section, and choose your payment method and the date you want the payment to occur. Most people choose the due date shown on their bill. You can change or cancel automatic payments anytime through your account.
Automatic payments post on the date you select, just like a manual payment. If your due date falls on a weekend or holiday, the payment may post on the next business day instead.
What to do if a payment does not post
If you paid online or by app and do not see the payment reflected in your account within two business days, log back into your account and check the payment history. Look for your confirmation number — if it appears there, the payment was received and is processing. If it does not appear, the payment may not have gone through.
If the payment is missing, contact Southwest Gas customer service at the number on your bill. Have your confirmation number ready if you have one. They can tell you whether the payment was received and, if not, help you resubmit it. Do not assume the payment went through just because you saw a confirmation screen — always verify it in your account history within a day or two.
Frequently Asked Questions
What happens if I pay after my due date?
Southwest Gas considers a payment late if it is received after 5 p.m. Pacific Time on the due date. Late payments may result in a late fee added to your next bill. If you know you will miss the due date, contact Southwest Gas to ask about a payment arrangement or extension — they sometimes offer short-term options to avoid a late fee.
Can I pay someone else's Southwest Gas bill?
Yes, if you have their account number. You can pay online, by app, or by phone using their account number instead of your own. The payment will be applied to their account. You do not need their permission to make a payment, but you will need their account number, which appears on their bill.
Is there a way to pay without giving my bank account number?
Yes — use a debit card instead of a bank account (ACH) transfer. Debit card payments are processed through the card network, not your bank account directly. You can also pay by mail with a check or money order, which does not require sharing your account number online.
What if I want to dispute a charge on my bill?
Contact Southwest Gas customer service before you pay. Explain the charge you believe is incorrect, and they can review your account and usage. Paying the bill does not prevent you from disputing it later, but calling first may resolve the issue faster and avoid a late fee if the charge is removed.
Can I set up automatic payments for a partial amount instead of the full bill?
Most autopay systems require you to pay the full amount due each month. If you want to pay a different amount, you will need to make manual payments instead. Contact Southwest Gas if you want to discuss a payment plan for a large balance.