Route guide · 1,259 miles
Cheap Flights from St. Louis to Phoenix
STL → PHX · Nonstop 3h 4m · Live round-trip fares
Flying from St. Louis to Phoenix doesn't have to drain your wallet. This 1,259-mile hop takes about 3h 4m nonstop, and fares swing a lot depending on the week you pick. Travelers who book roughly 3–6 weeks out usually come out ahead — set a free alert and let the deals come to you.
Live fares for STL → PHX are updating. Use the search below for real-time prices.
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See live fares
Updated daily
Flight time
3h 4m
Nonstop, typical
Distance
1,259 mi
STL → PHX
Book ahead
3–6 weeks
Best window, typically
Nonstop airlines
2
American Airlines, Southwest Airlines
Nonstop flights from St. Louis to Phoenix
Nonstop flights from St. Louis to Phoenix are flown by American Airlines, Southwest Airlines. The 1,259-mile trip takes about 3h 4m gate to gate, and nonstops are usually cheapest when booked 3–6 weeks ahead.
Booking insights: St. Louis → Phoenix
- Distance: 1,259 miles · nonstop flight time: 3h 4m.
- Cheapest upcoming week in the live data starts around Oct 22, with fares from $164.
- Fares tend to bottom out when you book about 3–6 weeks ahead — earlier than that rarely helps, later usually hurts.
- Tuesday and Wednesday departures usually undercut Friday and Sunday fares on routes like this one.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
Price trend
Cheapest departure weeks ahead
Departing around Oct 22 is currently the cheapest window — about $26 less than the nearest weeks. Based on recent fares found for this route; prices change quickly.
Cheapest month · St. Louis → Phoenix
October 2026
Every date's recent round-trip fare, at a glance.
Fares from
$164
Cheapest: Mon, Oct 26 — $164 · Priciest: Oct 22 — $245
Get this fare →Recent fares found for specific dates in October 2026. Blank days had no recent fare in our data — ask our team and we'll check them for you.
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Flying from St. Louis to Phoenix: what you need to know
The flight
At 1,259 miles, this is a long domestic flight — about 3h 4m gate to gate on a nonstop. It deserves a bit of planning: eat before you board or buy early (popular items sell out), and pick your seat with the flight length in mind.
Airlines on this route
American Airlines and Southwest Airlines fly this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from St. Louis (STL)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our St. Louis airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Phoenix (PHX)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Phoenix airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Phoenix to St. Louis fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 1,259 miles, booking 3–6 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Get to the airport two hours before departure; security, not the flight, is the part that runs late.
- If you're traveling with only a carry-on, you can skip the bag-drop line entirely with mobile check-in.
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 3h 4m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
St. Louis to Phoenix flight FAQs
How long is the flight from STL to PHX?
Plan on about 3h 4m in the air for a nonstop from St. Louis to Phoenix — the route runs roughly 1,259 miles. Connecting flights typically add 2–4 hours.
Are there nonstop flights from St. Louis to Phoenix?
American Airlines, Southwest Airlines typically operate nonstop flights from STL to PHX. Nonstops are usually cheapest when booked 3–6 weeks ahead of departure.
What is the cheapest month to fly from St. Louis to Phoenix?
Travelers usually find the gentlest prices away from peak periods — think post-holiday January and the early-fall weeks. Midweek dates inside those windows are cheaper still.
How much are last minute flights from STL to PHX?
Last-minute flights from STL to PHX (booked within 7 days of departure) typically cost noticeably more than fares booked 3–6 weeks out. Booking early is the smarter move.
What is a good round-trip deal from St. Louis to Phoenix?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from St. Louis to Phoenix?
You'll mainly see American Airlines, Southwest Airlines on St. Louis to Phoenix. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to St. Louis airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
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