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Hermosillo

$705+ 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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HMO
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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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 September 17, 2025.

Round-trip from

$705
(American Airlines)
From Lambert-St Louis to Hermosillo Gen Pesqueira Garcia
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Find flight deals from St. Louis to Hermosillo

Cheapest flights from St. Louis to Hermosillo
Explore the most affordable flight options available from St. Louis to Hermosillo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/16. 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.
Fri 10/3110:10 amSTL - HMO
2 stops27h 35mAmerican Airlines
Fri 11/71:26 pmHMO - STL
1 stop23h 14mAmerican Airlines
Deal found 9/16$705
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Fri 10/176:21 pmSTL - HMO
1 stop19h 24mAmerican Airlines
Sun 10/1912:25 pmHMO - STL
2 stops30h 26mAmerican Airlines
Deal found 9/15$883
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:00 amSTL - HMO
2 stops19h 38mDelta
Sun 10/196:10 amHMO - STL
2 stops14h 57mDelta
Deal found 9/15$948

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 September 17, 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

Fri 10/31

10:10 am-11:45 am

2 stops27h 35m

Hermosillo Gen Pesqueira Garcia

Fri 11/7

1:26 pm-1:40 pm

1 stop23h 14m

$705

St. LouisHermosillo

STL - HMO

STLHMO

Lambert-St Louis

Fri 10/17

6:21 pm-11:45 am

1 stop19h 24m

Hermosillo Gen Pesqueira Garcia

Sun 10/19

12:25 pm-8:51 pm

2 stops30h 26m

$883

St. LouisHermosillo

STL - HMO

STLHMO

Lambert-St Louis

Fri 10/17

6:00 am-11:38 pm

2 stops19h 38m

Hermosillo Gen Pesqueira Garcia

Sun 10/19

6:10 am-11:07 pm

2 stops14h 57m

$948

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

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.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Hermosillo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from St. Louis to Hermosillo?

    A quick flight from St. Louis to Hermosillo can take about 27h 35m. American Airlines provides one of the quickest options available for as low as $705. The distance between St. Louis and Hermosillo is about 1355 mi.

  • Can I find deals for flights from St. Louis to Hermosillo that include hotel bookings?

    Yes. In addition to deals on St. Louis to Hermosillo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Hermosillo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Hermosillo.

  • Can I find deals for business class flights from St. Louis to Hermosillo?

    Yes. Cheapflights offers flight deals from St. Louis to Hermosillo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Hermosillo?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Hermosillo (average of $414). Flying from St. Louis to Hermosillo in December is currently the most expensive (average of $836). 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.

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