American Airlines Flight 3623 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

American Airlines Flight 3623 Route Deals From $121

The cheapest prices found with in the last 7 days for return flights were $253 and $121 for one-way flights to Lambert-St. Louis Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Apr 29 - Wed, Apr 30
MIA
Miami Intl.
STL
Lambert-St. Louis Intl.
$253 Roundtrip, found 6 hours ago
$253
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Tue, Apr 29 from Miami Intl. to Lambert-St. Louis Intl., returning Wed, Apr 30, priced at $253 found 6 hours ago
Tue, Apr 29 - Wed, Apr 30
MIA
Miami Intl.
STL
Lambert-St. Louis Intl.
$263 Roundtrip, found 6 hours ago
$263
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Tue, Apr 29 from Miami Intl. to Lambert-St. Louis Intl., returning Wed, Apr 30, priced at $263 found 6 hours ago
Tue, Apr 29 - Wed, Apr 30
MIA
Miami Intl.
STL
Lambert-St. Louis Intl.
$272 Roundtrip, found 6 hours ago
$272
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Tue, Apr 29 from Miami Intl. to Lambert-St. Louis Intl., returning Wed, Apr 30, priced at $272 found 6 hours ago
Tue, Apr 29 - Wed, Apr 30
MIA
Miami Intl.
STL
Lambert-St. Louis Intl.
$294 Roundtrip, found 6 hours ago
$294
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Tue, Apr 29 from Miami Intl. to Lambert-St. Louis Intl., returning Wed, Apr 30, priced at $294 found 6 hours ago
Tue, Apr 29 - Wed, Apr 30
MIA
Miami Intl.
STL
Lambert-St. Louis Intl.
$303 Roundtrip, found 6 hours ago
$303
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Tue, Apr 29 from Miami Intl. to Lambert-St. Louis Intl., returning Wed, Apr 30, priced at $303 found 6 hours ago
Tue, Apr 29 - Wed, Apr 30
MIA
Miami Intl.
STL
Lambert-St. Louis Intl.
$313 Roundtrip, found 6 hours ago
$313
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Tue, Apr 29 from Miami Intl. to Lambert-St. Louis Intl., returning Wed, Apr 30, priced at $313 found 6 hours ago

Frequently asked questions

What route does flight number AA3623 take?
AA3623 is used on multiple routes, but the most common is between La Crosse Regional Airport and ORD. If your flight goes direct, you’ll touch down in about 1 hour and 20 minutes. Multi-stop flights can also operate under the same number, as can flights on other routes.
What kind of plane is on flight number AA3623?
If you’re on flight AA3623 from La Crosse, WI Airport (LSE-La Crosse Municipal) to O’Hare Airport, you’ll likely be jetting off on an Embraer RJ145. Flight AA3623 serves more than one route, but this is the most popular one.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your AA3623 flight with Travelocity, please visit our Customer Service Portal.