Best 21-day eSIM Plans for Vietnam
Going to Vietnam for 21 days (3 weeks)? These plans cover your full trip — all with instant QR delivery, no contract, and no SIM card to pick up at the airport.
Starting from (Free)
$2.34
Pro membership — save 7%
$2.18
Premium membership — save 12%
$2.06
Recommended 21-day plans — Vietnam
Best Value
Xin Chao
999 GB
30 days validity
$79.00
$0.08/GB
All 15 plans covering 21+ days
Xin Chao
999 GB
30 days validity
$79.00
$0.08/GB
Xin Chao
20 GB
30 days validity
$30.50
$1.52/GB
Xin Chao
10 GB
30 days validity
$20.00
$2.00/GB
Xin Chao
5 GB
30 days validity
$11.50
$2.30/GB
Xin Chao
3 GB
30 days validity
$8.50
$2.83/GB
Asialink
5 GB
30 days validity
$15.00
$3.00/GB
EUconnect
5 GB
30 days validity
$15.50
$3.10/GB
Oceanlink
5 GB
30 days validity
$15.50
$3.10/GB
EUconnect
3 GB
30 days validity
$9.50
$3.17/GB
Oceanlink
3 GB
30 days validity
$10.50
$3.50/GB
Eurolink
3 GB
30 days validity
$13.00
$4.33/GB
Asialink
3 GB
30 days validity
$13.00
$4.33/GB
Other trip lengths for Vietnam
21-day eSIM plans by destination
Frequently asked questions — 21-day Vietnam eSIM
What eSIM do I need for 21 days in Vietnam?
Look for a plan with at least 21 days of validity. The plans above all cover your full trip. Activate when you land — validity starts from first use, not from purchase.
How much data do I need for 21 days in Vietnam?
A typical traveler uses 1–2 GB per day for maps, messaging, and occasional video. For 21 days that is roughly 21–42 GB.
When should I install my Vietnam eSIM?
Install before you travel, at home over Wi-Fi. Activation begins when you arrive and connect to a local carrier.
Can I top up if I run out of data?
Many plans are rechargeable. You can purchase an additional plan from LTE.app at any time — no need to find a SIM card shop.
Save on every trip with Pro or Premium
Pro 7% off · Premium 12% off · Smart Coach AI · Offline activation
Vietnam travel connectivity
All Vietnam pages — linked for faster research
🏙️Top cities
📡Coverage
🌍Nearby destinations