Route guide · 1,259 miles
Cheap Flights from Phoenix to St. Louis
PHX → STL · Nonstop 3h 4m · Live round-trip fares
Plenty of travelers price out Phoenix to St. Louis every day — here's how to beat the average fare. Nonstops run about 3h 4m, and the calendar matters more than the airline. Aim to book 3–6 weeks ahead, stay flexible on the day of the week, and set a free alert so a price drop never slips past you.
Live fares for PHX → STL 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
PHX → STL
Book ahead
3–6 weeks
Best window, typically
Nonstop airlines
2
American Airlines, Southwest Airlines
Nonstop flights from Phoenix to St. Louis
The fastest way between the two cities is the nonstop: about 3h 4m for the 1,259-mile run from PHX to STL. Those flights are flown by American Airlines, Southwest Airlines. Prices behave best when you book 3–6 weeks out.
Booking insights: Phoenix → St. Louis
- Distance: 1,259 miles · nonstop flight time: 3h 4m.
- Cheapest upcoming week in the live data starts around Oct 15, with fares from $215.
- Fares tend to bottom out when you book about 3–6 weeks ahead — earlier than that rarely helps, later usually hurts.
- If your dates flex by a day or two, shifting to a midweek departure is the easiest saving there is.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
Price trend
Cheapest departure weeks ahead
Near-term departures around Oct 15 are currently the cheapest on this route. Based on recent fares found for this route; prices change quickly.
Cheapest month · Phoenix → St. Louis
October 2026
Every date's recent round-trip fare, at a glance.
Fares from
$215
Cheapest: Wed, Oct 21 — $215 · Priciest: Oct 26 — $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 Phoenix to St. Louis: 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 Phoenix (PHX)
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 Phoenix airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in St. Louis (STL)
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 St. Louis airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check St. Louis to Phoenix 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
- 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.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
Phoenix to St. Louis flight FAQs
How long is the flight from PHX to STL?
A nonstop from PHX to STL clocks in at around 3h 4m for the 1,259-mile trip. If you're connecting, budget an extra 2–4 hours depending on where you stop.
Are there nonstop flights from Phoenix to St. Louis?
American Airlines, Southwest Airlines typically operate nonstop flights from PHX to STL. Nonstops are usually cheapest when booked 3–6 weeks ahead of departure.
What is the cheapest month to fly from Phoenix to St. Louis?
There's no single magic month, but prices on this route generally soften in the shoulder season, when demand dips after the holidays and again in early fall. A free fare alert is the easiest way to catch those windows.
How much are last minute flights from PHX to STL?
Walking up to this route at the last minute is the expensive way to do it — prices inside 7 days of departure climb fast. The 3–6 weeks booking window is where the value sits.
What is a good round-trip deal from Phoenix to St. Louis?
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 Phoenix to St. Louis?
You'll mainly see American Airlines, Southwest Airlines on Phoenix to St. Louis. 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 Phoenix 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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