2FA is a measure to enhance the security of your flight bookings and KrisFlyer account. A six-digit, time-sensitive, randomly generated passcode, also known as a One-Time Password (OTP), will be sent to your registered contact details to verify your identity. This will serve as an additional layer of verification to prevent any unauthorised person from accessing or making changes to your flight booking or KrisFlyer account.  

For flight bookings, OTP is required to access passenger details, perform auto check in, change flights, or cancel flights. 

For KrisFlyer members, an OTP is required for selected KrisFlyer transactions (e.g. when you access your KrisFlyer profile or make changes to your redemption group nominees).  

As a default, the OTP will be sent to your registered mobile number to verify your identity. Should a mobile number not be available, the OTP will be sent to your registered email address.

Please ensure that the mobile number and email address indicated in your flight booking or KrisFlyer profile belongs to you, is up-to-date, and actively used.

Download the following guide for more details.

2FA has been introduced as part of our ongoing efforts to enhance online security for our customers. 

The following information is required for 2FA authentication: 

Flight bookings:

a. Booking reference number and last name 
b. One-Time Password (OTP) sent by Singapore Airlines. 

KrisFlyer account:  

a. KrisFlyer membership number and account password  
b. One-Time Password (OTP) sent by Singapore Airlines. 

For flight bookings, 2FA is optional. Once enabled, it will be applied when: 

• Accessing passenger details in your booking
• Turning auto check-in on 
• Changing date or time of your flight
• Cancelling your booking 

If you did not enable 2FA, you can access passenger details, make changes to your booking or cancel it, without the need for OTP verification via SMS or email. 

For KrisFlyer members, 2FA is applied when you perform selected KrisFlyer transactions online pertaining to your KrisFlyer account. These include: 

• Accessing and editing your KrisFlyer Profile 
• Adding / removing redemption group nominees in the booking  
• Adding / linking new redemption partners to convert miles to other loyalty programs (For example, Fliggy, Shangri-La Circle, Velocity, Esso, and CapitaStar) 
• Resetting your account password under “Need Help Logging In” in the KrisFlyer account login widget 
• Conversion of KrisFlyer miles to partner points (For example, Fliggy, Shangri-La Circle, Velocity, Esso, CapitaStar, Link Rewards, Marriott Bonvoy, and The Club) 
• Donation of KrisFlyer miles 
• Logging in to your KrisFlyer account on partner websites such as FlyScoot.com, KrisShop.com, KrisFlyervRooms.com and Pelago.co 
• Offsetting your carbon emissions on The Singapore Airlines Group Carbon Offset Programme microsite 

You can follow these steps to update your contact details:

1. Log in to your KrisFlyer account
2. Select the “Profile” tab*
3. Select the “Edit” button beside “Personal Details”
4. Your mobile number and email address can be edited under the “Contact Details” section
5. Select “Save”

*Please note that you will be prompted for 2FA under step 2.

Your mobile number should follow the international format which includes the plus sign (+) and the country code. Please see examples shown in the table below. Members should omit the extra ‘0’ used when making domestic calls where applicable. 

If your mobile number is not updated, request to receive your OTP via email in order to access your KrisFlyer profile. If both your mobile number and email address are not updated, contact KrisFlyer Membership Services to update your contact details.

We strongly encourage you to maintain individual mobile number and unique email address for your KrisFlyer account since key notifications and sensitive information pertaining to your account are sent to the mobile number and/or email address recorded in your KrisFlyer profile.  

Mobile number is mandatory for your KrisFlyer account as it is a more secure method to receive an OTP. In scenarios where you are unable to access your mobile phone or receive an OTP by SMS, you may request to receive the OTP via email.

If you do not include a mobile number in your KrisFlyer profile when 2FA is enabled, you may receive your OTP via email, after which you can update your mobile number before logging out.

No, your KrisFlyer account will not be locked. However, you will not be able to perform certain transactions. KrisFlyer accounts will be locked at login only if the wrong KrisFlyer account number and/or account password is entered after consecutive tries.

As the OTP is sent by default to your mobile number registered in your KrisFlyer profile, please ensure that your mobile operator is on the GSM network and provides SMS service. Please contact your mobile service operator for further details on receiving SMS sent from Singapore whilst overseas. 

For flight bookings, you can choose whether to send the OTP via mobile phone or email.  

You are encouraged to make booking changes and KrisFlyer transactions before leaving for your trip.  

In cases where you are unable to access your mobile phone or receive an OTP via SMS or experience a lag in receiving SMS, you may request to receive the OTP via email instead. 

An OTP is typically sent to your registered mobile number within seconds. If you are experiencing a delay in receiving your OTP, it could be due to a weak mobile connection. 

If you did not receive your OTP within two minutes, select “Resend OTP” to request for a new OTP. Note that there may be a delay in receiving the OTP via SMS if there’s a weak mobile connection.

Alternatively, you can request for the OTP to be sent via email.

If you are a KrisFlyer member, please verify that the mobile number in your KrisFlyer profile is updated.

There may be a delay in receiving the OTP via SMS in cases where the mobile connection is weak. If you requested the OTP via email, check the spam folder in your email account for the OTP email.

For urgent requests pertaining to upcoming flights, contact Singapore Airlines.

KrisFlyer members can approach KrisFlyer Membership Services for assistance with their flights. Verify the mobile number and email address registered in your KrisFlyer profile with our staff.

Please contact Singapore Airlines if you received an OTP but did not request for it. If you are a KrisFlyer member, contact KrisFlyer Membership Services for assistance. 

Select “Resend OTP” to request for a new OTP. Ensure that you enter the latest OTP sent to you within 3 minutes before it expires.