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Cheap Flights from Phoenix to St. Louis starting at S$ 51

We've found these cheap flights for you. You can book one-way or return flight tickets.

  • One way
  • Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Cheapest time to fly from Phoenix to St. Louis

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the lowest average weekly prices of the corresponding route on Trip.com.
Cheapest Airlines flying from Phoenix to St. Louis

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines
From S$ 51
United Airlines
From S$ 152
Sun Country Airlines
From S$ 172
Spirit Airlines
From S$ 189
American Airlines
From S$ 193
Southwest Airlines
From S$ 198
Alaska Airlines
From S$ 248
Delta Air Lines
From S$ 293
ANA airlines

Find more flights and airlines

Alternative Routes from Phoenix to St. Louis

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from Phoenix to St. Louis.

  • Cheapest
    Frontier Airlines
    PHX
    15:45
    2h 54m
    Direct
    STL
    20:39
    Sky Harbor International Airport - St. Louis Lambert International Airport
    Wed, May 15Frontier Airlines
    S$ 51
  • Allegiant Air
    AZA
    09:00
    10h 49m
    1 transfer
    STL
    21:49
    Phoenix-Mesa Gateway Airport - St. Louis Lambert International Airport
    Wed, Apr 17Allegiant Air
    S$ 511
  • Allegiant Air
    AZA
    09:00
    10h 49m
    1 transfer
    STL
    21:49
    Phoenix-Mesa Gateway Airport - St. Louis Lambert International Airport
    Wed, Apr 17Allegiant Air
    S$ 511
    Find More Flights

Frequently Asked Questions

  • When to buy flight tickets from Phoenix (PHX) to St. Louis (STL) the cheapest?

    Airlines adjust prices for flights from Phoenix to St. Louis based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.
  • How much is a flight from Phoenix (PHX) to St. Louis (STL) cost?

    According to Trip.com's data, the lowest price is around S$ 437.
  • How long is a flight from Phoenix (PHX) to St. Louis (STL)?

    It takes about 3 hours 8 minutes to fly from Phoenix (PHX) to St. Louis (STL).
  • What is the transportation method from the main airport to downtown in St. Louis?

    • The distance from St.Louis Lambert International Airport to downtown is about 20km, by taxi about 40 minutes.
  • What are the most popular airlines that fly from Phoenix (PHX) to St. Louis (STL)?

    Airlines with flights from Phoenix (PHX) to St. Louis (STL): Alaska Airlines, American Airlines and Southwest Airlines.
  • What's the most popular airline for direct flights from Phoenix (PHX) to St. Louis (STL)?

    American Airlines operates 2 direct flights from Phoenix (PHX) to St. Louis (STL).
  • How many airports in St. Louis?

Find cheapest flight ticket from Phoenix to St. Louis

Cheapest direct flight price

S$ 51

Cheapest return ticket price

S$ 105

Cheapest month

May

Peak season for travel

September