When purchasing tickets online at lan.com you are required to input your country of residence. For domestic routes entirely within Chile (specifically, scl-iqq-scl), the pricing comes out to be approximately 50% less if you enter Chile as country of residence, even when accessing the site from outside of Chile. Does anyone have any experience with this? Will the site actually let me purchase tickets? Is there likely to be trouble at the airport if it does? Does anyone know what happens if I wait and try to purchase tickets in Santiago?

Yes.

Yes. But you may have to call the Santiago office to complete the charge if using an outside of Chile issued credit card.

No.

Same issues of fare bucket availability as anywhere else and don't forget Lan's 21 day advance purchase requirement for the best price on their normal fares. If you find a great price, book it ASAP.

I booked four flights (on one e-ticket) online via lan.com from Australia: SCL - EZE, AEP - BRC, USH - AEP, EZE - SCL ... no problems at all, paid online using credit card, was issued with e-ticket via email - and have had no trouble with first two flights so far (seat assignments chosen online after booking were honored too).

booked a fully-flexible (there was no choice) SCL-PUQ o/w yesterday for $400 USD and checked today using Chile as country of residence.. came up with the same price but in Chilean Pesos.

The only thing you need to be sure of is that these lower fares are not "Available for residents of Chile only fares".

If you try to book domestic fares on Lan Argentina on the Argentinian version of lan.com, at the final stage of booking it tells you that in accordance with Argentinian law number whatever these fares are only available to residents of Argentina and eligibility will be required to be shown on boarding. It directs non-Argentine residents to the international sites of lan.com.

I don't know whether there are equvalent Chilean fares. If you are able to look at a copy of the complete rules fo the fare in question, there should be a clause titled Sales Restrictions or some thing like that. If it says restricted to residents of Chile then you take a risk purchasing. If it says ticket must be sold in Chile then buying an e-ticket on the Chilean website should be fine.

Unfortunately the fare rules shown on lan.com are not complete.

I think the bottom line is that if going right through the booking process nothing states that there are any of the above mentioned restrictions on sales, then you should be OK.

This is Chile not Argentina. There is no differential pricing in air fares for residents vs. non-residents.

First sentence pointless, second sentence useful.

Both sentences truthful but you're welcome anyways.

I just bought domestic tickets on the Peruvian version of the LAN site - cheaper than the UK version. All went fine until I had to put in my credit card. It came back with the 'Verified by Visa' prompt, but then gave an error message.
I called LAN in Peru, and sorted it over the phone - mentioning that the credit card was registered in the UK, and I'm neither UK nor Peruvian - but that didn't seem to be a problem.
Now we'll just have to wait until we check in