$287 Cheap Flights from St. Louis (STL) to Hermosillo (HMO)

View $287 flight on Thu, Nov 27, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Hermosillo, Sonora (HMO-General Ignacio Pesqueira Garcia Intl.)

Cheap Flights from St. Louis to Hermosillo (STL-HMO)

Prices were available within the past 7 days and start at $287 for one-way flights and $535 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Nov 26 - Fri, Dec 5
STL
St. Louis
HMO
Hermosillo
$535 Roundtrip, found 1 day ago
$535
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Nov 26 from St. Louis to Hermosillo, returning Fri, Dec 5, priced at $535 found 1 day ago
American Airlines
Wed, Nov 26 - Fri, Dec 5
STL
St. Louis
HMO
Hermosillo
$545 Roundtrip, found 1 day ago
$545
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Nov 26 from St. Louis to Hermosillo, returning Fri, Dec 5, priced at $545 found 1 day ago
American Airlines
Sun, Jan 25 - Sun, Feb 1
STL
St. Louis
HMO
Hermosillo
$597 Roundtrip, found 2 days ago
$597
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Jan 25 from St. Louis to Hermosillo, returning Sun, Feb 1, priced at $597 found 2 days ago
American Airlines
Sun, Jan 25 - Sun, Feb 1
STL
St. Louis
HMO
Hermosillo
$602 Roundtrip, found 2 days ago
$602
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Jan 25 from St. Louis to Hermosillo, returning Sun, Feb 1, priced at $602 found 2 days ago
American Airlines
Sun, Dec 14 - Wed, Dec 24
STL
St. Louis
HMO
Hermosillo
$605 Roundtrip, found 2 days ago
$605
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Dec 14 from St. Louis to Hermosillo, returning Wed, Dec 24, priced at $605 found 2 days ago
American Airlines
Wed, Nov 26 - Fri, Dec 5
STL
St. Louis
HMO
Hermosillo
$610 Roundtrip, found 1 day ago
$610
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Nov 26 from St. Louis to Hermosillo, returning Fri, Dec 5, priced at $610 found 1 day ago
American Airlines
Wed, Nov 26 - Fri, Dec 5
STL
St. Louis
HMO
Hermosillo
$615 Roundtrip, found 1 day ago
$615
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Nov 26 from St. Louis to Hermosillo, returning Fri, Dec 5, priced at $615 found 1 day ago
American Airlines
Sat, Jan 24 - Sun, Feb 1
STL
St. Louis
HMO
Hermosillo
$630 Roundtrip, found 2 days ago
$630
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Jan 24 from St. Louis to Hermosillo, returning Sun, Feb 1, priced at $630 found 2 days ago
Aeromexico
Tue, Jan 13 - Tue, Jan 27
STL
St. Louis
HMO
Hermosillo
$641 Roundtrip, found 1 day ago
$641
Roundtrip
found 1 day ago
Select Aeromexico flight, departing Tue, Jan 13 from St. Louis to Hermosillo, returning Tue, Jan 27, priced at $641 found 1 day ago
Delta
Mon, Jan 26 - Tue, Feb 3
STL
St. Louis
HMO
Hermosillo
$641 Roundtrip, found 2 days ago
$641
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Jan 26 from St. Louis to Hermosillo, returning Tue, Feb 3, priced at $641 found 2 days ago

Alternative airports near Hermosillo

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to General Ignacio Pesqueira Garcia Intl. HMO. Cheapest and Closest option available. Average driving time to city center is 10 minutes. Flights from $740
HMO
General Ignacio Pesqueira Garcia Intl.
CheapestClosest
Average driving time to city center10 min
Flights from $740

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO) cost?
Grab a cheap one-way flight from $287 or cheap return flight from $535 from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO)?
November is the least expensive month to fly from STL to HMO. Avoiding peak travel times is often the key to finding a great deal.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest STL to HMO flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to HMO?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO)?
To reach General Ignacio Pesqueira Garcia Intl. Airport (HMO) on schedule, pick a flight that leaves from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO) last-minute?
Last-minute fares from STL to HMO are typically more expensive. To lock in the best rates, start looking for flights as soon as possible. That said, if you can play around with your travel dates, it's possible to land a cheap fare just before your departure.
Is it cheaper to book a STL to HMO flight and hotel package?
Securing a STL to HMO flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our wide range of hotels and then add car rentals, flights and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to General Ignacio Pesqueira Garcia Intl. Airport (HMO)?
If you reserved your STL to HMO flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
General Ignacio Pesqueira Garcia Intl.
Airlines serving
Aeromexico, American Airlines, Delta
Roundtrip price
$535
Distance
1355 mi

Book with confidence

St. Louis to Hermosillo Flights

The cheapest times to fly from St. Louis to Hermosillo

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Hermosillo are during the month of November. You can find some of the cheapest flights from St. Louis to Hermosillo with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Hermosillo

Sunday is one of the best days to book for cheap flights from St. Louis to Hermosillo: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Hermosillo

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Hermosillo in 2025. You can also book with separate airlines for your outbound and return journeys, from $287 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Hermosillo flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Hermosillo airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Hermosillo Flights

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*Available to One Key members.