Cheap flights from St. Louis to Phoenix from $64
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Phoenix departing on 9/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from St. Louis to Phoenix
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Spirit Airlines flights from St. Louis to Phoenix Sky Harbor Intl Airport
Our best Spirit Airlines deals on St. Louis to Phoenix Sky Harbor Intl Airport flight tickets
American Airlines flights from St. Louis to Phoenix Sky Harbor Intl Airport
Our best American Airlines deals on St. Louis to Phoenix Sky Harbor Intl Airport flight tickets
See travel insights to Phoenix from
How to get the cheapest flight ticket from St. Louis to Phoenix Sky Harbor Intl Airport
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Phoenix Sky Harbor Intl Airport?
In general, July is the cheapest month to fly from St. Louis to Phoenix Sky Harbor Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $249. If you are unable to visit Phoenix Sky Harbor Intl Airport during the month of July, then departing from St. Louis during the month August is also very affordable. Most momondo users find prices during this month for around $268.
What is the cheapest day to depart on your flight to Phoenix Sky Harbor Intl Airport?
On average, the least expensive day to fly to Phoenix Sky Harbor Intl Airport from St. Louis is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $375. However, this price may fluctuate depending on the airline, the season, and holidays. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $494. These prices are subject to change though, so be sure to set up a Price Alert for flights to Phoenix Sky Harbor Intl Airport.
What is the cheapest time of day to depart on your flight to Phoenix Sky Harbor Intl Airport?
In the afternoon is the cheapest time of day to fly from St. Louis to Phoenix Sky Harbor Intl Airport when you can find flight prices for as low as $398. Flying to Phoenix Sky Harbor Intl Airport in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $443. Of course, these prices can vary depending on the time of year and what airport you fly to.
What is the cheapest Lambert-St Louis to Phoenix Sky Harbor Intl flight route?
Fly from Lambert-St Louis to Phoenix Sky Harbor Intl for the best Lambert-St Louis - Phoenix Sky Harbor Intl flight prices
How far in advance should I book a flight to Phoenix Sky Harbor Intl Airport?
You are more likely to see cheaper flights to Phoenix Sky Harbor Intl Airport from St. Louis when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to Phoenix Sky Harbor Intl Airport for around $361 when searching 4 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phoenix Sky Harbor Intl Airport from St. Louis for as low as $334 on momondo.
What cabin class options are available on Lambert-St Louis to Phoenix Sky Harbor Intl flights?
There are 3 cabin classes available to choose from on Lambert-St Louis to Phoenix Sky Harbor Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Lambert-St Louis to Phoenix Sky Harbor Intl?
Spirit Airlines, Southwest, and American Airlines are the most popular carriers operating from Lambert-St Louis to Phoenix Sky Harbor Intl
What airlines fly to Phoenix Sky Harbor Intl Airport?
American Airlines, Southwest and Frontier are the top three most popular airlines that fly to Phoenix Sky Harbor Intl Airport from St. Louis according to our data. American Airlines is the first choice among our users, with 53% of people opting to fly with this airline when traveling to Phoenix Sky Harbor Intl Airport. Keep in mind that there are 5 different airlines that fly to Phoenix Sky Harbor Intl Airport on a routine basis, so you have a few additional options to choose from.
How many flights depart from St. Louis to Phoenix Sky Harbor Intl Airport on average per day?
As of June 2025, 7 flights take off from St. Louis and land in Phoenix Sky Harbor Intl Airport each day. The most common flight departure time for this route is 6:00PM, with 36% of daily flights taking off at noon.
How many flights depart from St. Louis to Phoenix Sky Harbor Intl Airport on average per week?
The number of flights available between St. Louis and Phoenix Sky Harbor Intl Airport is 49 per week as of June 2025. The most frequent departure day is Mon, with 22% of weekly flights leaving on this day.
When to book flights from St. Louis to Phoenix Sky Harbor Intl Airport
Cheap St. Louis to Phoenix Sky Harbor Intl Airport (STL to PHX) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Phoenix Sky Harbor Intl Airport
How far is Lambert-St Louis to Phoenix Sky Harbor Intl by plane?
Phoenix Sky Harbor Intl is 1265.4 mi away from Lambert-St Louis. Typically, this will take 3h 10m by plane in normal conditions.
When did momondo last update prices for flights from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport?
Prices for flights from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport?
The number of operators available for flights from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport is 5 as of June 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport.
What documentation or ID do you need to fly to Phoenix Sky Harbor Intl Airport?
The travel and health documents you'll need for your trip to Phoenix Sky Harbor Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Phoenix Sky Harbor Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Phoenix Sky Harbor Intl Airport?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to Phoenix Sky Harbor Intl Airport is Boeing 737 MAX 8, representing 20.67% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 20.36%, Boeing 737-700 Passenger/BBJ1 (winglets) at 16.41%, and Airbus A320-100/200 at 10.29%.
What is the most popular airline from St. Louis to Phoenix Sky Harbor Intl Airport?
Based on momondo bookings for flights between St. Louis and Phoenix Sky Harbor Intl Airport, the leading airline is American Airlines, making up 49% of the total bookings. Other popular airlines include Southwest with 31%, Frontier with 17%, and Delta with 2%.
Best airlines flying from St. Louis to Phoenix Sky Harbor Intl Airport
Compare and see reviews for airlines that fly from St. Louis to Phoenix Sky Harbor Intl Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $103 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $152 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $216 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $226 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $290 | Free Cancellation | Rating 8.0 4,287 reviews |
Southwest Flights From St. Louis to Phoenix Sky Harbor Intl Airport
Southwest operates around 37 flights from St. Louis to Phoenix Sky Harbor Intl Airport every week. The average price of these flights found in the last 72 hours has been $443, but momondo users have found Southwest deals from St. Louis to Phoenix Sky Harbor Intl Airport from as low as $290 round-trip. Southwest has been scored 8.0/10 in 4,287 reviews.
American Airlines Flights From St. Louis to Phoenix Sky Harbor Intl Airport
American Airlines (7.2/10 from 10,000 reviews) operates around 6 flights from St. Louis to Phoenix Sky Harbor Intl Airport in any given week. The average American Airlines airfare for this route is around $373, with deals from around $152 rare but found on momondo. Referenced prices are for round-trip St. Louis to Phoenix Sky Harbor Intl Airport flight searches in the last 72 hours.
Traveling to a place near Phoenix?
Book flights to Phoenix if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from St. Louis to Phoenix?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Phoenix. momondo saves you time and could save you money on your trip.
Can I find flights from St. Louis to Phoenix with flexible booking policies on momondo?
momondo does allow users to show only those flights to Phoenix from St. Louis which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from St. Louis to Phoenix?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Phoenix from St. Louis.
I’m not ready to book a flight from St. Louis to Phoenix right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Phoenix, momondo offers a useful price alert feature which will track prices for flights to Phoenix from St. Louis and alert you when they change.