Can I Make an Appointment in Vientiane After Arriving in Udon Thani?

Get yourself to udon..then taxi the 60 kilometres to the border....taxi about 1000 bhat....

Have you tried using Nok Air? They have a fly and drive service. That’s always been on time for me so far.

They fly you to Udon Thani then co-ordinate your land border crossing with their vans and drop you off in Vientiane.

They do the reverse on the way back if you need it. Really helpful if you want to do a visa + border run.

Second the lao visa in advance

You can make it BUT you need to NOT have any checked luggage, AND you need to have your shit together to get off the plane, get out there and catch that mini-van that lugs you to the Nong Khai Border

It's 60 KM from the airport to the border So you need to hustle..

I would take people's advice and get your Lao visa BEFORE you go so that you're not queuing up to buy it at the border

Yep. Done that a few times.

If the appointment time is crucial I would either make it later in the day or go a day earlier!

I fly in and out of Thailand (Phuket) very regularly and every time my flight is delayed by at least one hour due to late arrival of plane, adverse weather, engineering issues etc!

Got back from Saigon last week, three hours late ( late departure and then put in a holding pattern for 40 minutes because of thunderstorms and high winds) and then waited almost an hour getting through immigration with only four IO's on duty!

You can speed up the immigration process on the Laos side by getting an eVisa in advance instead of getting the regular Visa on Arrival.

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But other then the time needed to get from a to b, is there also a question about a Visa?

No you have to book online now...

Not at 9am, but before 12 am ;-Q

Theoretical yes, but n case of flight delays, flat tires, blocked road due to accidents it could not always work out in practice

Yes