This Travel Hacker Flies Around the World for Almost Nothing

Ben Schlappig, just 25 years old, shares his secrets for how he says he has flown four million miles in his life.
7:17 | 07/28/15

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Transcript for This Travel Hacker Flies Around the World for Almost Nothing
If you haven't booked your summer vacation yet, no worries. The guy you are about to meet says last minute travel can actually work to your advantage. And tonight he is sharing all of his hacks to help you get around the globe like he does. Which is to say in some very serious style. Here's ABC's David Wright. ? Reporter: Even if you are a jet setter, even if you are an executive platinum diamond-plus, global services, frequent flier, chances are you never met anyone as devoted to the art as Ben shlapin. I fly 400,000 miles a year. Reporter: What's known as a travel hacker. A savant in the realm of travel loyalty programs. I eat, breathe travel. Reporter: At age 25 he has probably thrown more miles than you will in a lifetime. I have flown 4 million miles. Reporter: 4 million miles enough to go to the moon and back eight times. Or around the world 160 times. Where have you been in the past week to ten days? Reporter: In the past ten days I have been, I don't even know. Reporter: You don't know? I really don't. Reporter: Come on. I couldn't tell you starting Monday. I wake up in the morning. Look at the calendar. Figure out what is happening. Reporter: The industry may call him travel hacker. He doesn't like the term because hacking implies something nefarious. Some one like Justin Ross lee made famous in the viral video from elite daily. I answer a lot of hate mail. You're a real . Reporter: Ruthlessly enjoying every perk he can grab. I don't scam airlines. Airlines scam consumers. They're a goliath. I'm David. Reporter: Ben doesn't break any rules. Mine is to stay within the guidelines maximize my value but don't break rules. Reporter: What he does xiz mro -- is exploit the fine print. You heard of American association of retired persons. Have you heard of aarp term life. Reporter: You are a member of aarp? I am. Completely legitimate. There are no age requirements to join. You save $400 on british class tickets. Reporter: He lived out of his carry-on suitcase since last April. Do you ever miss the comforts of home? I do. Something nice about having a fridge and something to come home to. Reporter: It is not stocked with tiny little bottles. Exactly. Reporter: On the rare occasions he does make it home to visit his parents. He is still dreaming of far off adventures. This is Benjamin's flight simulator. He loves playing with that when he has free time. Reporter: He can afford to do this because he master the fine print of travel and credit card loyalty programs. Deal them out. What have you got here? What do you want. Just about everything. Every Cardish ourer, airline, hotel. Credit cards. Reporter: Every single one of them. Remember, George Clooney in that movie "Up in the air." How dare you bring that into this palace? Reporter: Ben is George Clooney 2.0. Which credit card do you use for every day spending? American Express card. Which American Express? You want to do everyday preferred. This gives you triple points on supermarkets. American Express will let you have four credit card. As many as you want. Seven am can express card. One, two, three, four credit cards. Reporter: Why so many? Business. There is benefits for each of these. This gets you triple points on airfare. Spend a lot on airfare the good part. American Express platinum into the centurian lounges. Reporter: Other card he uses to double or triple his points. One mile at a time. That's his blog. And his philosophy. This is more than just a hobby for you, right? This is a job? It is a job. It's an obsession. I guess my life. Reporter: You take it to a whole another level? I guess it is very different. For me getting there is half the fun. Often more than half the fun. Depend on the airline. Go to the middle east a fair amount, flying emirates there in first-cl first-class. You get a shower on a plane. Have you ever showered on a plane? A little jaded nowadays. I giggle every time I shower on a plane. Reporter: Ben is meeting up with two apprentice hobbyists people he inspired. Carrie and Stephen, two working professionals who used Ben's advice to travel the world on the cheap. Probably flown 2 million miles. The trip to Charleston would have been about $2,000 to $2,500 for airfare and hotels. Saving using miles and taxes and fees that are probably costing me $100, $200. Probably spent about -- oh, let's say $16,000, $20,000 on luxury vacations over seven years. It's not cheap. I am still putting out $20,000. Maybe a little more. But probably about $150,000 value. Reporter: All that plastic gives them something more than just bragging rights. If you have all these credit card don't you have, doesn't that lower your credit score? Like on a scale of 850, the credit score last I checked was 837 in the top two percentile. I have over 40 credit cards open. Reporter: Airlines are constantly changing the rules making it difficult for people to earn miles for free trips. Our guy has about 40 different credit cards and a credit score he says of 837. How is that possible? It's not the number of credit card that you have per Se, but how you are managing those credit card that ultimately deter mmines whether you are worthy or unworthy? What do you think of the guys? Genius. Fun, genius. I think it is time consuming. A lot of time on your hand. These are professionals. Reporter: Professionals or not. There are practical money saving tips for those of us a little closer to Earth. Tich O tip one, use the right credit card. Something you should really consider. The difference between earning one point per dollar and three points per dollar could be huge. Reporter: Tip two, no such thing as a free smilmile. Redeem them when you are getting good value out of them. Reporter: Tip three, book really early or really late. This is why I book so many tickets often the same day. Reporter: Last minute travel is okay? The best time to plan. Jimmy: Jet set status means airlines and hotels treat him better than most of us mere mortals. Expedited tsa screening, access to high level lounges even run ins with fellow hobbyists are par for the course. Ever been to Cairo? Reporter: Even so like George Clooney in the movie he looks forward to the day when he can unpack his carry-on for good. Until I figure out where I actually want to be I will keep moving if hopefully not forever. Getting a dog and a house. And never getting on a plane again? You crave that? I do. Chicago for a day. Then on to the next stop. In the meantime let's have some fun. Reporter: He figures he might as well enjoy every mile. I'm David Wright for "Nightline" in New York.

This transcript has been automatically generated and may not be 100% accurate.

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