PHX offers short security lines, typically under 10 minutes, ensuring a quick start to your journey to STL.

Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $191 (Frontier) |
One-way from | $27 (Kiwi.com) |
Popular in | January |
Cheapest in | August |
Average price | $350 |
Good round-trip deal | $308 or less |
Good one-way deal | $144 or less |
Fly from
Fly to
Route
Depart
Return
Price
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 12/11
6:30 pm-10:20 pm
Nonstop2h 50m
Lambert-St Louis
Sun 1/4
5:00 am-7:35 am
Nonstop3h 35m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 12/17
6:30 pm-1:01 am
1 stop5h 31m
Lambert-St Louis
Thu 12/25
7:20 am-1:23 pm
1 stop7h 03m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 12/11
10:55 am-7:10 pm
1 stop7h 15m
Lambert-St Louis
Fri 1/2
7:20 am-1:23 pm
1 stop7h 03m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 12/11
6:30 pm-12:48 am
1 stop5h 18m
Lambert-St Louis
Thu 1/1
7:20 am-1:23 pm
1 stop7h 03m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Thu 12/4
6:30 pm-12:48 am
1 stop5h 18m
Lambert-St Louis
Tue 12/9
9:00 am-2:00 pm
1 stop6h 00m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Mon 11/10
12:59 am-8:55 am
1 stop6h 56m
Lambert-St Louis
Tue 11/18
2:21 pm-6:56 pm
1 stop5h 35m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 12/10
12:59 am-9:10 am
1 stop7h 11m
Lambert-St Louis
Sun 12/14
9:00 am-2:00 pm
1 stop6h 00m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 11/5
4:15 pm-8:05 pm
Nonstop2h 50m
Lambert-St Louis
Mon 11/10
5:20 am-7:45 am
Nonstop3h 25m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Tue 12/9
8:25 am-12:20 pm
Nonstop2h 55m
Lambert-St Louis
Fri 1/2
5:00 am-7:35 am
Nonstop3h 35m
PhoenixSt. Louis
PHX - STL
PHXSTL
Phoenix Sky Harbor Intl
Wed 11/26
6:27 pm-12:46 am
1 stop5h 19m
Lambert-St Louis
Tue 12/2
6:30 am-1:12 pm
1 stop7h 42m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
To ensure you get the cheapest price possible for a flight from Phoenix Sky Harbor Intl Airport to St. Louis, you should look to book at least 87 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Currently, February is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to St. Louis (average of $130). Flying from Phoenix Sky Harbor Intl Airport to St. Louis in April is currently the most expensive (average of $301). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
A simple way to save on the total cost of your ticket is to fly from Phoenix Sky Harbor Intl Airport to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 6% on your trip compared to booking a flight at noon.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to St. Louis flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Comfort
Entertainment
Crew
Boarding
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Boarding
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Boarding
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Boarding
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Boarding
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Boarding
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$230 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$198 | Average$386 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$259 | Average$352 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$269 | Average$400 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$277 | Average$406 | FlexibilityNo cancel fee | On-time63% |