STL

Find cheap United Airlines flights to St. Louis from $100

1 adult

Search hundreds of travel sites at once for deals on United Airlines flights to St. Louis

Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Free to useThere are no hidden charges or fees.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Useful Info
Flights Deals

Cheap United Airlines Flight Deals to St. Louis

 
Here are some of the best deals found on KAYAK recently from United Airlines to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip United Airlines flight deals to St. Louis

KAYAK's recommended round-trip United Airlines deals departing in the coming months to St. Louis.
Discover the best prices for you by selecting your travel dates on KAYAK.
United Airlines Logo
6:48 am - 10:45 amIAD-STL
4h 57m1 stop
United Airlines Logo
5:27 pm - 12:30 amSTL-IAD
6h 03m1 stop
$199United Airlines
Find Deal
Thu, May 29 - Fri, May 30
United Airlines Logo
8:40 am - 9:59 amIAD-STL
2h 19mnonstop
United Airlines Logo
8:15 am - 11:23 amSTL-IAD
2h 08mnonstop
$204United Airlines
Find Deal
Fri, Jul 4 - Sat, Jul 5
United Airlines Logo
8:40 pm - 11:59 pmDEN-STL
2h 19mnonstop
United Airlines Logo
4:32 pm - 6:01 pmSTL-DEN
2h 29mnonstop
$210United Airlines
Find Deal
Wed, Jun 11 - Tue, Jun 17
United Airlines Logo
8:40 am - 9:59 amIAD-STL
2h 19mnonstop
United Airlines Logo
5:30 pm - 12:30 amSTL-IAD
6h 00m1 stop
$214United Airlines
Find Deal
Fri, Jul 4 - Sat, Jul 5
United Airlines Logo
8:40 pm - 11:59 pmDEN-STL
2h 19mnonstop
United Airlines Logo
3:35 pm - 8:35 pmSTL-DEN
6h 00m1 stop
$220United Airlines
Find Deal
Wed, Jun 11 - Tue, Jun 17
United Airlines Logo
9:38 pm - 11:43 pmEWR-STL
3h 05mnonstop
United Airlines Logo
5:20 pm - 8:55 pmSTL-EWR
2h 35mnonstop
$221United Airlines
Find Deal
Sun, Aug 3 - Tue, Aug 12
United Airlines Logo
1:25 pm - 4:31 pmDEN-STL
2h 06mnonstop
United Airlines Logo
4:32 pm - 6:01 pmSTL-DEN
2h 29mnonstop
$223United Airlines
Find Deal
Tue, May 27 - Tue, Jun 3
United Airlines Logo
5:55 pm - 7:22 pmIAD-STL
2h 27mnonstop
United Airlines Logo
5:27 pm - 12:30 amSTL-IAD
6h 03m1 stop
$229United Airlines
Find Deal
Sat, May 24 - Sat, May 31
United Airlines Logo
8:29 am - 10:18 amEWR-STL
2h 49mnonstop
United Airlines Logo
5:27 pm - 11:12 pmSTL-EWR
4h 45m1 stop
$231United Airlines
Find Deal
Sat, Jun 7 - Sat, Jun 7
United Airlines Logo
9:29 pm - 11:34 pmEWR-STL
3h 05mnonstop
United Airlines Logo
6:00 am - 9:35 amSTL-EWR
2h 35mnonstop
$232United Airlines
Find Deal
Wed, Jul 16 - Sun, Jul 20
Useful Info

Good to know

Low seasonJanuary
High seasonMay
Cheapest flight$100
Average price round-trip$336
Good deal one-way$165
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Washington Dulles Airport to St. Louis
(avg. price over the last 2 weeks)
or less

When to book flights with United Airlines to St. Louis

Average price per month
Flight prices as travel date approaches

FAQs for flying to St. Louis with United Airlines

  • Which other airlines fly to St. Louis?

    Along with United Airlines, you can also fly to St. Louis with Delta, Southwest, American Airlines, Spirit Airlines, Frontier and Delta.

  • How much is a flight to St. Louis with United Airlines?

    On average, United Airlines flights to St. Louis cost $281 one-way.

  • Which airport do United Airlines flights to St. Louis fly into?

    You’ll fly into St. Louis Lambert Airport when flying to St. Louis with United Airlines.

  • Are there any other airlines in Star Alliance that fly to St. Louis?

    Unfortunately, there are no other airlines in Star Alliance that fly to St. Louis.

Top tips for your flights to St. Louis with United Airlines

  • The cheapest flight to St. Louis with United Airlines found on KAYAK in the last 2 weeks departed from Washington, D.C. Dulles Intl Airport and cost $88.

United Airlines customer reviews

7.4
GoodBased on 8,696 verified guest reviews
7.7Boarding
6.6Food
7.3Comfort
7.1Entertainment
8.1Crew
Pros +
Cons -
Show reviews that mention
Traveler rating:
Sort by:
A
8.0 Very good
Everything
D
10.0 Wonderful
No issues, great flight, great crew
V
10.0 Wonderful
Friendly crew, all very smooth
V
8.0 Very good
Crew friendly and efficient. Nobody seated next to me
B
2.0 Poor
Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy
A
10.0 Wonderful
Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍
A
8.0 Very good
A bit rush for transit. Food and entertainment are not available
A
8.0 Very good
So far so good but food and entertainment are not available for this flight
D
10.0 Wonderful
Boarding was a little difficult. The gate area at O'Hare was very small and crowded due to multiple gates in the area. Could not hear the intercom, so had to rely on signage to see when my group was boarding and the signage was blocked by passengers standing in the gate. Flight was great and we arrived in Montreal on time.
L
8.0 Very good
Good
Read more about United Airlines

Everything you need to know for your flight to St. Louis

Other airlines flying to St. Louis

Flight deals from the most popular airlines with KAYAK users flying the route
Frontier flights to St. Louis
American Airlines flights to St. Louis
Delta flights to St. Louis
Southwest flights to St. Louis
Alaska Airlines flights to St. Louis

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.