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

A quick flight from St. Louis to Hermosillo can take about 18h 04m. American Airlines provides one of the quickest options available for as low as $781. The distance between St. Louis and Hermosillo is about 1355 mi.

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.

What is the cheapest day to fly from St. Louis to Hermosillo?

Travelers seeking maximum savings on their St. Louis to Hermosillo flight should consider departing on Friday mornings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Hermosillo ranges from 0.1 - 3.2 inches per month. July is typically the wettest month, when rainfall can reach 3.2 in. April is typically the driest time to visit Hermosillo when rainfall is around 0.1 in.

If weather is an important factor for your trip to Hermosillo, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 89.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 60.8 F).

What is the cheapest time of day to fly from STL to HMO?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Hermosillo as you normally would.

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.

$288+ Flights from St. Louis to Hermosillo

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Cheap flight deals from St. Louis to Hermosillo

Round-trip from	$781 (American Airlines)
One-way from	$288 (Kiwi.com)

From Lambert-St Louis to Hermosillo Gen Pesqueira Garcia

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One-way flight from Lambert-St Louis to Hermosillo Gen Pesqueira Garcia

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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 agosto 20, 2025.

vie. 10/177:41 pmSTL - HMO

2 stops18h 04mAmerican Airlines

dom. 10/1912:25 pmHMO - STL

2 stops33h 16mAmerican Airlines

Deal found 8/17

$781

Best flights from St. Louis to Hermosillo
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 agosto 20, 2025.

vie. 10/177:41 pmSTL - HMO

2 stops18h 04mAmerican Airlines

dom. 10/1912:25 pmHMO - STL

2 stops33h 16mAmerican Airlines

Deal found 8/17

$781

One-way flights from St. Louis to Hermosillo
Search for one-way flight options from St. Louis to Hermosillo. Find affordable one-way fares based on user searches. Data last updated agosto 20, 2025.

mar. 9/27:54 pmSTL - HMO

3 stops50h 11mMultiple Airlines

Deal found 8/19

$288

mar. 9/27:53 amSTL - HMO

1 stop6h 12mAmerican Airlines

Deal found 8/19

$330

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Hermosillo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHermosillo

STL - HMO

STLHMO

Lambert-St Louis

vie. 10/17

7:41 pm-11:45 am

2 stops18h 04m

Hermosillo Gen Pesqueira Garcia

dom. 10/19

12:25 pm-11:41 pm

2 stops33h 16m

$781

St. LouisHermosillo

STL - HMO

STLHMO

Lambert-St Louis

mar. 9/2

7:54 pm-8:05 pm

3 stops50h 11m

$288

St. LouisHermosillo

STL - HMO

STLHMO

Lambert-St Louis

mar. 9/2

7:53 am-12:05 pm

1 stop6h 12m

$330

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/19

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

How long is the flight from St. Louis to Hermosillo?
A quick flight from St. Louis to Hermosillo can take about 18h 04m. American Airlines provides one of the quickest options available for as low as $781. 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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$288+ Cheap flights from St. Louis (STL) to Hermosillo (HMO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/2. Fares are subject to change and may not be available on all flights or dates of travel.

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Find flight deals from St. Louis to Hermosillo

Cheapest flights from St. Louis to HermosilloExplore 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 agosto 20, 2025.

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 agosto 20, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Hermosillo that are best for you.

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.

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?

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

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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 agosto 20, 2025.