The fastest way to pay Southwest Gas is through their website at swgas.com, where you can set up a one-time payment or enroll in automatic monthly payments
Southwest Gas serves customers in Arizona, Nevada, and New Mexico. You can pay your bill online without creating an account — you'll need your account number and the amount due, both printed on your bill. The website accepts credit cards, debit cards, and bank transfers. Payments made before 5 p.m. Mountain Time on a business day typically post the same day.
If you prefer not to pay online, Southwest Gas also accepts payments by phone, mail, and in person at authorized payment locations. Each method has different timing, so knowing which one you use matters if your bill is due soon.
Key Takeaways
- Online payments at swgas.com process same-day if submitted before 5 p.m. Mountain Time on a business day, with no account login required.
- Automatic payments from a bank account cost nothing and ensure you never miss a due date, though you can cancel anytime.
- Phone payments (1-877-508-5088) take the same time as online but charge a fee if you use a credit or debit card.
- Mail payments take 7 to 10 business days to reach Southwest Gas, so send them at least two weeks before your due date.
- Late fees begin 18 days after the bill date, and service can be disconnected 30 days after that if the account stays unpaid.
Paying online without logging in
Go to swgas.com and look for the "Pay My Bill" button on the homepage. Click it and select "Pay as a Guest" — you do not need to create an account. Enter your account number (a 10-digit number on your bill), the amount you want to pay, and your zip code. The system will pull up your account and show your current balance.
Choose your payment method: credit card, debit card, or electronic bank transfer. Credit and debit cards are charged a convenience fee (the amount varies). Bank transfers have no fee. Enter the payment date you want — same-day is available if you submit before 5 p.m. Mountain Time on a business day. You'll get a confirmation number immediately.
Setting up automatic monthly payments
Automatic payments remove the risk of forgetting a due date. Log in to your Southwest Gas account at swgas.com or create one if you don't have one yet. Go to "Billing & Payments" and select "Autopay." You can choose to pay the full bill amount each month or a fixed amount you set yourself.
Automatic payments can come from a checking or savings account at no charge. You pick the day of the month the payment should process — many people choose a few days after payday. You can change or cancel autopay anytime through your account, and Southwest Gas will send you a confirmation email each month before the payment goes through.
Paying by phone
Call Southwest Gas at 1-877-508-5088 to pay over the phone. Have your account number and the amount ready. A representative will process the payment while you're on the call. If you pay with a credit or debit card, a convenience fee applies. Bank account payments have no fee.
Phone payments process the same day if you call before 5 p.m. Mountain Time on a business day. After hours, your payment is queued for the next business day. You'll receive a confirmation number at the end of the call.
Paying by mail
Write a check or money order payable to Southwest Gas. Include your account number on the check. Mail it to the address printed on your bill — the address changes depending on which state you're in. Do not mail cash.
Mail payments take 7 to 10 business days to arrive and post to your account. If your due date is within two weeks, mail is too slow — use online or phone payment instead. Keep a copy of the check or the confirmation number from your bill stub in case you need to prove payment later.
In-person payment locations
Southwest Gas has authorized payment centers in Arizona, Nevada, and New Mexico where you can pay in cash, check, or debit card. Find the nearest location by visiting swgas.com and searching "Pay in Person" or calling 1-877-508-5088 for the address closest to you.
In-person payments process immediately, so your account is credited the same day. This is the only way to pay with cash. Bring your account number or bill with you.
What happens if you miss the due date
Your bill is due 18 days after the bill date. If payment is not received by then, a late fee is added to your account. The amount of the late fee depends on your bill size but is shown on your next bill. You can still pay without penalty if you pay before the 18-day mark, even if you receive a notice.
If your account stays unpaid for 30 days after the bill date, Southwest Gas can disconnect your service. Before disconnection, you'll receive a notice in the mail and a call or text message. If you cannot pay the full amount, contact Southwest Gas to ask about payment plans or hardship programs — they may be able to work with you.
Frequently Asked Questions
Do I have to create an account to pay my bill online?
No. You can pay as a guest at swgas.com using only your account number and zip code. Creating an account is optional and lets you set up autopay and view your payment history, but it is not required to make a one-time payment.
What is the convenience fee for paying with a credit card?
Southwest Gas does not charge a fee for online or phone payments made from a bank account. Credit and debit card payments do have a fee, but the exact amount is shown before you confirm the payment, so you can see it upfront.
Can I set up autopay to pay only part of my bill each month?
Yes. When you enroll in autopay, you can choose to pay the full bill amount or enter a fixed amount you prefer. You can change the amount anytime through your account or by calling 1-877-508-5088.
What time zone is the 5 p.m. cutoff for same-day payment?
The cutoff is 5 p.m. Mountain Time. Arizona does not observe daylight saving time, so the cutoff is the same year-round. Nevada and New Mexico do observe daylight saving time, so the cutoff shifts one hour in spring and fall.
Can I pay someone else's Southwest Gas bill?
Yes, if you have their account number. You can pay as a guest online or call 1-877-508-5088 with the account number and amount. The payment will post to that account. You do not need to be the account holder.