[7] Despite crashing out early at Daytona, Dillon got his first career pole at Texas Motor Speedway in June and finished third, leading 20 laps.

After rain shortened the season finale at the Homestead-Miami Speedway, Dillon was crowned the 2011 NASCAR Camping World Truck Series Champion.

[citation needed] Dillon made his first career start in the NASCAR Sprint Cup Series on October 9, 2011, in the Hollywood Casino 400 at Kansas Speedway.

[12][13] Dillon competed in the Sprint Cup Series on a limited basis in 2012, starting at Michigan International Speedway in June, driving the No.

[15] Dillon also participated in one race in the NASCAR Canadian Tire Series at Circuit Gilles-Villeuneuve in Montreal in August 2012.

[16] Dillon announced in August 2012 that he would continue to drive full-time in the Nationwide Series for 2013, with Advocare as the primary sponsor for the full season, along with running seven Sprint Cup Series races that year, including the 2013 Daytona 500, where he qualified 8th, but crashed late in the race, relegating him to a 31st-place finish.

[18] Dillon returned to the Truck Series for the inaugural Mudsummer Classic at Eldora Speedway, leading a race-high 63 laps,[19] and won after a green-white-checker finish.

14 Stewart-Haas Racing Chevrolet at Michigan due to Stewart's leg injury;[22] he would also drive the car at Talladega Superspeedway in October.

[23] In Dillon's run at Talladega, he performed well during the event, and was running in the top five for most of the day; at the white flag, Dillon was third behind Jamie McMurray and Dale Earnhardt Jr. and was about to give Earnhardt Jr. a push for an attempt to make a winning pass when he was turned by Ricky Stenhouse Jr., slammed the backstretch wall, then was sent airborne when struck hard in the rear bumper by Casey Mears.

[24] On November 16, 2013, Dillon won the NASCAR Nationwide Series Championship with a 12th-place finish in the season finale at Homestead-Miami Speedway.

[30] On the final lap of the Xfinity race in Fontana, Dillon battled with Kyle Busch, whose car had cut a left front tire, the two making contact as they approached the finish.

[31] Then at the second Bristol race, Dillon won after Kyle Busch and Brad Keselowski both wrecked late in the going.

[33] Dillon opened the season with a fourth-place finish in his Can-Am Duel, where he pushed Denny Hamlin past the dominant car of Dale Earnhardt Jr. to win the race.

After struggling early on in the Coca-Cola 600, Dillon would finally earn his first career Cup Series win after passing Jimmie Johnson, who ran out of fuel on lap 399 and held off Kyle Busch and Martin Truex Jr.

[36] After the Charlotte race, Dillon would not score another top-five finish in the Cup series until a fourth-place run at the Southern 500 at Darlington.

[40] Dillon and RCR showed qualifying speed early in the season, winning pole awards at Auto Club[41] and Talladega.

However, with 40 laps to go, as severe weather was approaching the track, Clint Bowyer made contact with Dillon causing a multi-car accident.

[43] At Las Vegas, Dillon managed to score his first top-five finish of 2020 and first since the 2018 Consumers Energy 400, coming home fourth.

[44] On July 19, Dillon broke an 88-race winless streak by claiming his 3rd career victory at the 2020 O'Reilly Auto Parts 500 at Texas Motor Speedway.

[46] On August 15, it was announced that Dillon tested positive for COVID-19, forcing him to miss the Go Bowling 235 at Daytona; Kaz Grala served as his replacement for the race.

[48] At the Southern 500, Dillon had to start from the rear as a result of unapproved adjustments, later had to take an unscheduled pit stop for a flat tire, and rallied to finish second.

[51] Dillon began the 2021 season with a win in his Duel for the Daytona 500 by passing Bubba Wallace on the final lap, which enabled him to start fourth for the 500.

[54] Dillon won the Coke Zero Sugar 400 at Daytona to clinch a spot in the playoffs in a 1-2 finish with teammate Tyler Reddick.

Dillon would later score two consecutive top-10 outings at the Charlotte Roval, giving him his second-career road course top 10 finish, (10th place) and then a 10th-place result at Las Vegas.

[62][63] Three days later, it was announced that NASCAR had encumbered the win, docked Dillon 25 driver points and stripped him of his playoff eligibility.

[67] In 2021, Dillon joined RWR-Eurasia Motorsport for his 24 Hours of Daytona debut, sharing an LMP2 car with Cody Ware and Salih Yoluç.

[68] In 2019, Dillon made a cameo in the movie Stuber alongside brother Ty and fellow driver Daniel Suárez.

[69] Dillon guest starred in the television series SEAL Team's Season 3, Episode 14 "Objects in Mirror", as a NASCAR driving instructor for the protagonists.

[70] The Crew, a 2021 NASCAR-centric Netflix series, featured cameo appearances from Dillon and fellow Cup racers Ryan Blaney and Cole Custer.

* Season still in progress 1 Ineligible for series points (key) (Bold – Pole position awarded by qualifying time.