Vuelos de United de St. Louis (STL) a Phoenix (PHX) desde $131

For information on any present Phoenix Sky Harbor Airport quarantine requirements and travel advice, visit the Covid-19 Travel Advisor. Check before you arrange your flight, so you don’t get caught up.

Your ticket usually displays which terminal your United Airlines flight will be leaving from at Lambert Field. It might also be able to give you the arrival details for PHX. If not, you could always ask your airline.

United Airlines doesn’t offer direct flights between Lambert-St. Louis Intl. Airport (STL) and Phoenix Sky Harbor Airport, so be prepared to make a stopover. If you have time to spare between flights, browse the airport shops while waiting for your connection.

Bring that novel you’ve been eager to read. A flight from Lambert Field to Phoenix Sky Harbor Intl. Airport with United Airlines will take on average 5 hours and 34 minutes. You’ll have more than enough time to completely lose yourself in the enthralling plot.

Take your pick of roughly 5 flights daily with United Airlines from STL to Phoenix Sky Harbor Airport.

For more info about changing your flight to PHX, please visit our Customer Service Portal.

This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that 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 2021, flights departing on a Monday 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 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.