How Far in Advance Should You Get Travel Vaccines?

Two weeks. That's when most people start thinking about travel vaccines — two weeks before they fly, usually after a mild panic triggered by a friend saying "wait, have you sorted your jabs?" The answer, almost always, is no.

Here's the thing. Two weeks is fine for some vaccines. Hepatitis A gives you solid protection within two weeks of the first dose. Typhoid injectable works within about ten days. So if you're heading to Morocco for a fortnight and you've left it late — not ideal, but you can probably still cover the essentials.

But rabies? That's three doses. Minimum 21 days between first and last. If you're trekking in Nepal or heading somewhere rural in Southeast Asia where getting bitten by a dog or monkey isn't just hypothetical — and it really isn't — you need to start that course at least a month before departure. Ideally more, because clinics get busy and fitting in three appointments around your actual life takes longer than you'd think.

The vaccines that catch people out

Japanese Encephalitis is another one. It's a two-dose vaccine with a minimum gap of 28 days between doses. So if you're planning any significant time in rural Asia during summer months, you need to have started this almost two months before you go. Most people have never heard of it until they're sitting in the travel clinic.

Hepatitis B — if you haven't had it as a child — is a three-dose course over six months for the standard schedule, though there's an accelerated option over three to four weeks. Worth knowing about if time is short.

And Yellow Fever. Technically one dose, effective after ten days. Simple enough. Except some countries require a certificate that's valid for life — and they check. So you need the actual stamped documentation, not just the memory of having had the injection years ago.

So when should you actually book?

Eight weeks before departure is the honest answer for most trips. Six weeks if you're disciplined. That gives you enough runway to complete any multi-dose courses, let single-dose vaccines take full effect, and have the conversation with a clinician about your specific itinerary — because "Southeast Asia" is not one health profile, and a good travel nurse will want to know exactly where you're going and what you're doing there.

If you're going somewhere genuinely high-risk — rural India, sub-Saharan Africa, parts of South America — I'd say ten to twelve weeks. Not because every vaccine needs that long, but because you want time to think it through properly, do a second appointment if needed, and not be making rushed decisions when you're already stressed about packing.

What if you've left it too late?

Go anyway. Obviously. But be honest with your travel clinic about the timeline. There are accelerated schedules for some vaccines. There are risk-reduction strategies for others. And for some destinations, partial protection is meaningfully better than none — even if you can't complete the full course before you leave.

The worst outcome isn't leaving late. It's not going at all because you panicked about the timing and talked yourself out of it. Get to a clinic, be upfront about the date, and let them figure out what's achievable. That's what they're there for.

Check what vaccines you need for your destination on WhichVax →