Despite earning a test with
British American Racing at year's end, Bell returned to America where he replaced
Mark Taylor for
Panther Racing in the
Indy Racing League IndyCar Series midway through
2004, and posted a best finish of fifth. He started one race as an injury replacement for
Tomáš Enge in the same car in
2005. He made his first
Indianapolis 500 appearance for
Vision Racing in 2006, qualifying fifteenth and finishing 22nd. He returned to the IndyCar Series in
2008 driving the No. 23 car in events where
Milka Duno was not scheduled to race. His best result in 2008 was an eighth place finish at
Richmond International Raceway in June. He also was entered in a third team car in the Indy 500, where he qualified twelfth and finished tenth. In
2009,
KV Racing Technology entered Bell in the Indy 500, engineered by Gerald Tyler. Bell was on a limited-month schedule but had an impressive race day, advancing from 24th on the grid up to the top-five. Passing Team Penske's
Will Power on the last restart, Bell impressed with a fourth-place finish. Bell posted his best Indianapolis 500 qualifying effort to date in
2011, racing for
Sam Schmidt Motorsports, once again engineered by Tyler. By qualifying fourth fastest, he started the 95th running of the Greatest Spectacle in Racing on the inside of the second row. Bell finished ninth in the
2012 Indianapolis 500 with
Sam Schmidt Motorsports, engineered by Tyler. His
2014 Indianapolis 500, back with KV Racing Technology in the No. 6
Robert Graham Dallara-Chevrolet, marked his eighth start in the event and seventh consecutive. Bell qualified fourth and led twelve laps in the 2016 Indy 500, racing for Andretti Autosport, before an incident on pit road during caution. He finished 21st. It was also during this week that he clocked a top speed of 241.637 mph. ==Sports car career==