RDU's compact layout makes it easy to navigate, with two terminals connected by a central parking garage tunnel.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $128 (Frontier) |
One-way from | $52 (Trip.com) |
Popular in | June |
Cheapest in | January |
Average price | $374 |
Good round-trip deal | $369 or less |
Good one-way deal | $254 or less |
Fly from
Fly to
Route
Depart
Return
Price
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
fre 1/23
9:36 pm-11:11 am
1 stop14h 35m
Lambert-St Louis
sön 1/25
5:42 pm-9:01 pm
1 stop26h 19m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
tis 1/27
7:10 am-11:33 pm
2 stops17h 23m
Lambert-St Louis
fre 1/30
11:18 am-8:51 pm
1 stop8h 33m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
ons 12/31
6:15 pm-7:30 pm
Nonstop2h 15m
Lambert-St Louis
ons 1/7
8:15 am-11:05 am
Nonstop1h 50m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
tis 1/27
5:35 pm-6:55 pm
Nonstop2h 20m
Lambert-St Louis
fre 1/30
8:15 am-11:05 am
Nonstop1h 50m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
tis 1/27
3:02 pm-9:13 pm
2 stops7h 11m
Lambert-St Louis
fre 1/30
6:30 am-2:06 pm
2 stops6h 36m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
fre 12/19
2:35 pm-10:33 pm
1 stop8h 58m
Lambert-St Louis
sön 12/21
10:57 am-12:13 am
1 stop12h 16m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
ons 12/24
1:05 pm-9:40 am
1 stop21h 35m
Lambert-St Louis
tors 12/25
11:51 am-12:13 am
2 stops11h 22m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
tors 1/8
1:29 pm-10:58 pm
1 stop10h 29m
Lambert-St Louis
mån 1/12
6:30 am-4:21 pm
2 stops8h 51m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
tis 12/16
10:02 am-4:06 pm
1 stop7h 04m
Lambert-St Louis
tis 1/6
6:00 am-11:52 am
1 stop4h 52m
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
fre 2/6
6:15 am-2:30 pm
1 stop9h 15m
Lambert-St Louis
mån 2/9
11:20 am-9:05 pm
2 stops8h 45m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
Booking 67 days in advance of your planned departure date is, on average, the best time to get cheap flights from Raleigh to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, January is the cheapest month in which you can book a flight from Raleigh to St. Louis (average of $137). Flying from Raleigh to St. Louis in March is currently the most expensive (average of $248). 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.
Unlike at noon, when flights are generally more expensive, you can save up to 20% on flights from Raleigh to St. Louis by exploring options for tickets in the afternoon.
Travelers seeking maximum savings on their Raleigh to St. Louis flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Overall
Comfort
Crew
Food
Boarding
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Comfort
Crew
Food
Boarding
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Comfort
Crew
Food
Boarding
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Comfort
Crew
Food
Boarding
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Overall
Comfort
Crew
Food
Boarding
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$138 | Average$241 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$226 | Average$374 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$248 | Average$384 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$271 | Average$401 | FlexibilityNo cancel fee | On-time63% |