Cheapest Way to Stay Connected Overseas: eSIM vs Roaming vs Travel SIM for Singaporeans

Every Singaporean faces the same dilemma before a trip: how do I get data overseas without paying through the nose? The options have exploded in the last few years — your telco's roaming add-on, eSIM apps like Airalo and Jetpac, physical travel SIM cards from Changi, or just tethering off a friend and hoping for the best.

The price difference between making the right choice and the wrong one can be $20-50 per trip. Over a few trips a year, that adds up. This guide compares the real cost across the 3 destinations Singaporeans travel to most — Japan, Korea, and Thailand — so you can pick the cheapest option before your next flight.

Prices sourced from Singtel, Airalo, and Jetpac.

The 3 Options Explained (30 Seconds)

Price Comparison: Japan (7-Day Trip)

Japan is the most popular destination for Singaporean travellers. Here's what each option costs for a typical 7-day trip with moderate data usage (3-5 GB):

For a typical 7-day Japan trip, the sweet spot is Airalo's 3GB/30-day plan at $13 or Jetpac's 3GB/7-day at ~$13.50. Both are cheaper than Singtel ReadyRoam ($18/4GB) and you can buy them from your couch before departure. If you're a heavy user who needs more than 5GB, Singtel's UnlimitedRoam at $35/15GB is actually reasonable value.

Price Comparison: South Korea (7-Day Trip)

Korea pricing is similar to Japan across most providers since both fall under the same "Asia" category:

Same story as Japan — Airalo's 3GB at $13 beats Singtel's $18 for less data. For Korea specifically, Jetpac's larger 30GB plan at ~$47 is interesting if you're a heavy streamer or travelling for 2+ weeks.

Price Comparison: Thailand (5-Day Trip)

Thailand is where things get interesting — Singtel has a specific "Neighbours" plan that makes roaming surprisingly competitive:

Thailand is the one destination where Singtel roaming genuinely competes. The ReadyRoam Neighbours plan at $12/6GB is hard to beat — it's cheaper per GB than Airalo and requires zero setup beyond tapping "activate" in the My Singtel app. For a short Thailand trip, just use your telco's roaming. Don't overthink it.

The Verdict: Which Option to Pick

How to Set Up an eSIM (First-Timers)

If you've never used an eSIM before, it's simpler than it sounds:

1. Check your phone supports eSIM — most iPhones from XS onwards and Samsung Galaxy S20+ onwards support eSIM. Check your phone settings under Cellular/Mobile Data.
2. Make sure your phone is unlocked — if you bought it on a telco contract, it may be locked. Contact your telco to unlock it (usually free after contract ends).
3. Buy the eSIM plan on the provider's app or website (Airalo, Jetpac, etc.). You'll receive a QR code.
4. Scan the QR code in your phone's eSIM settings. Label it "Travel" or the destination name for easy identification.
5. When you land, enable the eSIM data line and turn off data roaming on your primary SIM. Your SG number stays active for calls and WhatsApp — only data routes through the eSIM.

The whole process takes about 2 minutes before departure. You can buy and install it days in advance — it only activates when you connect to the destination network.

Common Mistakes to Avoid

• Not activating any plan and paying default roaming rates: This is the biggest rip-off. Without a roaming add-on or eSIM, default pay-per-use data roaming can cost $10-20 per day. Always activate something before departure.
• Forgetting to turn off data roaming on your primary SIM: When using an eSIM for data, make sure your physical SIM's data roaming is OFF. Otherwise your phone might route data through the expensive primary SIM instead of the eSIM.
• Buying more data than you need: Most travellers use 1-3 GB per week unless they're streaming video. Don't buy a 10GB plan for a 5-day trip — you're unlikely to use it all.
• Assuming eSIM includes calls/SMS: Most eSIM plans are data-only. Your WhatsApp, Telegram, and Grab will work fine over data, but traditional calls and SMS go through your SG SIM (and may incur roaming charges). Use VoIP for calls.
• Not checking Singtel ReadyRoam first for Southeast Asia: For Thailand, Malaysia, and Indonesia, Singtel's Neighbours plan is genuinely cheap. Don't automatically assume eSIM is always cheaper — check both.

The Bottom Line

For most Singaporean travellers in 2026, the answer is simple: use an eSIM for Japan, Korea, and Northeast/East Asian destinations (Airalo or Jetpac at $4.50-13 for a week). Use your telco's roaming add-on for Southeast Asia (Singtel ReadyRoam Neighbours at $5-12). And never, ever travel without activating some form of data plan — the default roaming rates will shock you.

Pair your data plan with the right credit card for overseas spending to maximise savings on your trip. Cards with 0% foreign transaction fees (like Trust Bank) or high overseas miles earn rates (like HSBC TravelOne at 2.4 miles/$1) can save you another 3-5% on every overseas purchase.

Check the latest credit card sign-up promotions for travel cards and don't forget to activate your complimentary travel insurance before you fly.

Disclaimer: Prices are accurate as of April 2026 and may change. Jetpac prices are listed in USD and converted to SGD at approximately 1.35x. Always check the provider's app or website for current pricing before purchasing. This article is for informational purposes only.