United Flights from St. Louis (STL) to San Diego (SAN)

Once you receive the boarding pass for your United Airlines flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to San Diego, CA (SAN-San Diego Intl.), you should be able to determine which terminals you'll be flying in and out of. Your airline will be able to help if those details are missing from your ticket.

As you can't go nonstop from St. Louis, MO (STL-Lambert-St. Louis Intl.) to San Diego, CA (SAN-San Diego Intl.) with United Airlines, make the most of your stopover. Relax with some drinks at a nice airport bar, or go for a wander around the terminal and enjoy a little retail therapy.

Watch a few TV episodes, enjoy some music or just put your seat back and take it easy. You'll need to find a way to pass the 6 hours and 3 minutes that it takes to venture from St. Louis, MO (STL-Lambert-St. Louis Intl.) to San Diego, CA (SAN-San Diego Intl.) with United Airlines.

You'll have a choice of roughly 3 flights each day with United Airlines from St. Louis, MO (STL-Lambert-St. Louis Intl.) to San Diego, CA (SAN-San Diego Intl.).

For more info about changing your flight to San Diego, CA (SAN-San Diego Intl.), please visit our Customer Service Portal.

This just in! Airfares offered on Tuesdays tend to be the cheapest, according to flight demand on Travelocity in 2019. Wednesday and Friday prices are also good, but you may want to prepare your budget if booking on a Monday, as data shows the start of the week is when prices are generally at their highest.

Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2019, flights departing on a Tuesday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.

Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2019 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 1-2 weeks prior to their travel dates.

We'll let you in on a secret...You can save big on flights if you mix and match your airlines and fare types. In fact, travelers who booked flights on Travelocity in 2019 saved nearly 50% when their return flights consisted of two different airlines or fare types.

*According to flight demand on Travelocity.com from January to December 2019. Savings are subject to change based on departure location, date and destination.