$651+ Cheap flights from St. Louis (STL) to Hermosillo (HMO)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HMO
Dec 21 — Dec 281
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Find flight deals from St. Louis to Hermosillo
Best flights from St. Louis to HermosilloDiscover carefully curated flight deals from St. Louis to Hermosillo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 21, 2025.
Discover carefully curated flight deals from St. Louis to Hermosillo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 21, 2025.
This American Airlines deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/262:30 pmSTL - HMO
1 stop23h 00mAmerican Airlines
Mon 3/21:10 pmHMO - STL
1 stop23h 40mAmerican Airlines
Deal found 11/20![American Airlines logo]()
$651
This American Airlines deal was found by Cheapflights users on 11/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/12:26 pmSTL - HMO
1 stop22h 58mAmerican Airlines
Sun 4/512:55 pmHMO - STL
1 stop8h 52mAmerican Airlines
Deal found 11/18![American Airlines logo]()
$734
Cheap flight deals from St. Louis to Hermosillo
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Hermosillo (HMO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 21, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | Expedia 3 stars |
Round-trip from | $651 (American Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Hermosillo that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 21, 2025.
Use the filters below to find and compare flights from St. Louis to Hermosillo that are best for you.
Fly from
St. Louis
Fly to
Hermosillo
Route
Depart
Return
Price
St. LouisHermosillo
STL - HMO
STLHMO
Lambert-St Louis
Thu 2/26
2:30 pm-12:30 pm
1 stop23h 00m
Hermosillo Gen Pesqueira Garcia
Mon 3/2
1:10 pm-1:50 pm
1 stop23h 40m
$651
St. LouisHermosillo
STL - HMO
STLHMO
Lambert-St Louis
Wed 4/1
2:26 pm-11:24 am
1 stop22h 58m
Hermosillo Gen Pesqueira Garcia
Sun 4/5
12:55 pm-11:47 pm
1 stop8h 52m
$734
Compare providers for flights from St. Louis to Hermosillo
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Hermosillo in November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star |
- Most accurate provider: When it comes to deals on St. Louis-Hermosillo flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Hermosillo flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Hermosillo flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Hermosillo flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Hermosillo flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Hermosillo
Have a flexible travel schedule? Discover the best time to fly to Hermosillo from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.