Delta, which has $7.53 billion assets in its plan, led the batch with its Delta Pilots Savings Plan. According to CNBC.com, Delta's plan charges less than 0.25 percent each year and the average participant has an account balance of $504,000.
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UPS, at No. 10, has $1.29 billion assets in its UPS/IPA Defined Contribution Money Purchase Pension Plan.
UPS tests a delivery drone deployed from a truck in Lithia, Fla. on Feb. 20, 2017.
Here are the 10 companies with the best 401(k) plans, according to BrightScope:
1. Delta Air Lines
2. National Football League
3. Saudi Aramco
4. Southwest Airlines
9. Takeda Pharmaceuticals
Learn more about companies and their 401(k) ratings at BrightScope.com.