Buying airfare that permits a 'Free Stopover'
I will use my specific situation, but this should only be considered as an example which should be applied generally. My itinerary would be as such:
London --> Austin --> Rio de Janeiro --> London
and my goal is to do this as cheaply as possibly. After receiving this epic answer I learned that my best option is to find a flight via the US that allows for some sort of 'extend stopover.' referred to as a Free Stopover. Continuing my research I found a flight on the American Airlines website for a return ticket that has two stopovers, one in each direction:
London --> Dallas --> Rio de Janeiro --> New York --> London
for a very good price. To be clear Dallas and New York are stopovers. This would be ideal since Dallas is only a three hour drive from Austin. Now, the question is, how do I book this itinerary that allows an extended stopover. In other words, I would like to land in Dallas on Monday and then take the flight to Rio the following Friday i.e. 5 days later.
I realise there are already similar questions out there (such as this one and this one), but they don't cover the specific and pragmatic issue of exactly how to book such a ticket. Obviously, I can already just buy the ticket online, but how do I change the date of the Dallas --> Rio flight?
EDIT
I should clarify, that the flight I found has two stopovers, but I only need the one in Dallas. Also, and I am not sure if I am becoming annoyingly redundant yet, but I am not looking to simply get a stopover, but to have what is termed a Free Stopover, that is being able to arrive in Dallas, but then have a flight for Rio scheduled days later, but still within the dates of my return ticket.
Best Answer
Almost all travel websites allow you to book a "multi-city" itinerary, where you can enter multiple legs and dates for each leg.
As the trip you've listed appears to be all on American Airlines you could book it on their website (www.aa.co.uk if you're in the UK) by clicking on the "Multi-City" link on the homepage (note that on AA, this is actually a link, not a check-box like the Return and One-way options). You could also use any of the popular travel websites like Orbitz, Expedia, etc.
Most websites allow you to enter up to (at least) 6 flights and their respective dates - in your case you just have 4 (LON-DFW, DFW-GIG, GIG-NYC, NYC-LON).
On the AA site specifically, make sure that you select the "Search by Price" option, otherwise it may end up showing you more expensive flights first.
In practice, many websites Multi-City searches are fairly bad at finding you the cheapest flights - I'm not familiar enough with AA's search to know if it fits into that category, but often it's a good idea to use something like ITA Software's flight search in Multi-city mode to find the exact flights/dates that are cheapest, and then select those exact same flights on the AA website.
If you're not comfortable booking this online then you could also do it over the phone with the airline or with a travel agent, but be aware that they will most likely charge you an additional fee to do this!
Pictures about "Buying airfare that permits a 'Free Stopover'"
Does Delta allow free stopovers?
Delta is the only airline that allows free stopovers on domestic flights, so I'll show an example of that. I've decided to fly Los Angeles to Atlanta roundtrip with a free stopover in Minneapolis on the outbound, so my first flight will be LAX-MSP.How can I fly somewhere for free?
How to Fly for Free:What does free stopover mean?
Enticing travelers with a "free" stopover leads to hotel bookings, restaurant meals, and other tourism dollars that otherwise wouldn't have been spent. To book a stopover, select "multi-destination" or "multi-city" on the airline's website and plug in the specific dates for your desired stopover.What are hidden city tickets?
Hidden-city airline ticketing is when a traveller purchases a ticket from departure point A to destination point B, with a stop at transfer point C, with the intention of finishing the journey at point B and therefore throwing away the rest of the journey.Buying Flight Ticket Online (10 MISTAKES + Google Flights tips)
More answers regarding buying airfare that permits a 'Free Stopover'
Answer 2
Since you've narrowed it down to a specific airline, the answer is simple, contact their booking department and ask them directly. They do charge a small fee for booking made via phone, but it is probably worth it if you can secure the flight at the the price you've found.
It is entirely possible that they do now allow you to do this at the price you found. They may view the stops in Dallas and New York as incidental and charge you very differently for the kind of arrangement you are looking for.
Answer 3
There is an old techinque called the "Open Jaw Ticket" that would get you what you want. Imagine, for example, if you did this:
LON -> DFW (on 1/1) with a return DFW -> LON (on 1/31)
There is nothing that says you couldn't also fly
DALLAS (DFW) -> RIO (GIG) (on, say, 1/3) RIO -> DALLAS (on 1/30).
Throwing NYC into the mix makes it a little more complicated, since your interior ticket now becomes a multi-city, but you get the idea. (I think the exact nature would be LON -> NYC, with an interior of NYC->GIG, and GIG->DFW. Involves one extra leg though...)
Normally, this tactic was used when weekend layovers were required. I used to fly to Detroit every week, so I would fly IAD -> DET on Monday Week 1, with a return of Fri Week 2. For the intervening weekend, I would just have a DET -> IAD round-trip the weekend in the middle.
That said, this technique will guarantee you get the layover you want - just schedule your flights accordingly.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Emrah Yazıcıoğlu, Cup of Couple, Sheikh Abrar Ul Haq, energepic.com