Thankfully, when it comes to United Airlines baggage fees, there are several ways ... who arrive at security with a standard carry-on size bag will be charged a fee starting at $35.

In addition, all airlines impose size and weight restrictions on checked ... all these fees are approximately doubled, but use United's baggage calculator to confirm for specific destinations.

Southwest Airlines will start charging for checked bags on May 28. See how fees compare to other airlines and who still qualifies for free bags.