# Can't check in Singapore Airlines online

If you can’t check in online with Singapore Airlines Customer Support **[phone]**, it may be due to several reasons such as international travel requiring document verification, booking through a partner airline, technical issues, or special services like unaccompanied minors. Ensure you’re within the 24-hour check-in window and try using the Fly Singapore app or a different browser. If the issue persists, visit the airport early or contact **[phone]** Singapore customer support for assistance.

## Why Singapore Online Check-In May Fail

Online check-in is normally available **24 hours before departure**, but several reasons may prevent you from completing it successfully:

### 1. Flight Not Within Check-In Window

Online check-in opens exactly **24 hours before your flight's departure**. If you attempt earlier, the system won’t allow check-in until that window opens.

### 2. Booking Through Partners or Codeshare

If your itinerary includes codeshare flights (e.g., Singapore booking but operated by KLM, Air France, etc.), Singapore may restrict online check-in. You must check in via the **operating carrier’s website/app**.

### 3. International Travel or Document Verification Required

International flights often need additional visa or passport checks that the online system can’t handle. It flags these and requires **in-person check-in**.

### 4. Special Passenger Needs

Traveling with minors, pets, unaccompanied children, or requesting special services (wheelchairs, etc.) usually triggers in-person check-in.

### 5. Technical Glitches or App Issues

Website/app failures, outdated browsers, or device incompatibility can interrupt check-in. Clearing cache, switching devices/browsers or updating often solves this.

### 6. Ticketing or Reservation Problems

Issues like an unpaid baggage fee, incomplete payment, or mismatch in reservation details may also block check-in until resolved.

### 7. Security Selection or SSSS

Random security screening selections (including “Secondary Security Screening Selectee” / SSSS) force in-person document verification, disabling online check-in.

## Common Real-World Experiences

Real passengers frequently report check-in failures. Here are a few verbatim from Singapore’s subreddit:

> **“Flight is … international flight that says I need to be three hours early to check in… Singapore desk does not open until 4 AM tomorrow.”**

Another described needing airport help due to passport issues:

> **“I had the passport information and then it errors out with … ‘an airport agent needs to verify you possess all the documents required for your international journey.’”**

And another notes codeshare complications:

> **“This happens to me every time I fly Singapore internationally … Singapore seems to be a problem with me. … You have to go to the ticket counter for a document check.”**

These stories validate the common issues: SSSS triggers, passport/visa checks, codeshares, and technical issues.

## Fixes and Workarounds

### ✅ 1. Time It Right

Check in **once the 24‑hour window opens**. Before that, the system blocks attempts.

### ✅ 2. Use Singapore's Mobile App

If the website fails, try the **Fly Singapore mobile app**, which sometimes manages check-ins better.

### ✅ 3. Switch Devices or Browsers

Switch from desktop to mobile or vice versa, or use a different browser. Clearing cookies/cache may also help.

### ✅ 4. Visit Airport Kiosk or Counter

If still blocked, use the **self-service kiosk** or see an agent at the airport. They can verify your documents and complete check-in.

### ✅ 5. Resolve Booking Issues

Check for missing fees or confirmations (e-ticket, payment). Contact Singapore Support (1-800-221-1212) to resolve any holds.

### ✅ 6. Prepare for International Flights

Bring all necessary documents: passport, visa, proof of onward travel, ESTA/visa confirmation. Allow extra time at airport .

### ✅ 7. Check for SSSS or Security Flags

If selected for SSSS or flagged in the security system, online check-in is disabled. In-person verification is required .

## What To Do at the Airport

1. **Head straight to a kiosk** to see if you can self-check.
2. If kiosk fails, **get in line at the ticket counter**. Be transparent: say the web/app won’t allow check-in.
3. **Show all documents** needed: passport, visa, onward ticket, pet papers, etc.
4. Arrive **at least 60 minutes (domestic)** or **120–180 minutes (international)** before departure. For flights requiring screenings, allow more time.

## Tips to Avoid Check-In Problems

* **Book directly** through Singapore to reduce system mismatches.
* **Enter accurate info** exactly as in passports/tickets.
* **Update app/browser** before the 24-hour mark.
* **Monitor Singapore alerts**: app may notify you if everything's automated.
* **Have digital & printed docs** ready if you're flagged or traveling internationally .

## FAQ

### Q1: **“Can I still check in if the website/app fails?”**

**Yes.** You can use a kiosk or agent at the airport. Keep your flight confirmation number and travel documents handy.

### Q2: **“Why can’t I check in for codeshare flights?”**

Codeshare flights require use of the operating airline’s system—Singapore’s platform may block you.

### Q3: **“My flight is international—do I have to check in at the airport?”**

Often yes. Passport, visa, and entry requirements may need verification. Online check-in may will be disabled .

### Q4: **“I got an 'SSSS' or flagged—what now?”**

Secondary Security Screening Selectee means extra verification. You can only check in at the airport after providing documents.

### Q5: **“Technical issues—what helps?”**

Use a different browser or device, clear cache/cookies, update apps, check your internet connection.

### Q6: **“Is there a Singapore customer service number?”**

Yes—call **1‑800‑221‑1212** for reservation or technical help. You can also use the Fly Singapore app chat.

### Q7: **“How early should I arrive?”**

Singapore recommends **60 minutes pre-departure for domestic**, and **120–180 minutes for international flights** to allow for document checks and security.

## One-Minute Summary

If you **can’t check in online with Singapore**:

* Check within the **24‑hour window**
* Use the **Fly Singapore app**, try different devices/browsers
* **Expect to check in at airport** for international flights, special services, codeshares, or flagged passengers
* **Bring all documents** and arrive early
* Contact Singapore support if reservation issues persist

By understanding the root causes—document verification, booking type, technical glitches, or security—you can plan accordingly and avoid surprises at the airport. Safe travels! ✈️