$289 Cheap Flights from Hermosillo (HMO) to St. Louis (STL)

View $289 flight on Wed, Nov 5, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $289 for one-way flights and $656 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Fri, Oct 10 - Mon, Oct 13
HMO
Hermosillo
STL
St. Louis
$656 Roundtrip, found 4 days ago
$656
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Mon, Oct 13, priced at $656 found 4 days ago
American Airlines
Fri, Oct 10 - Mon, Oct 13
HMO
Hermosillo
STL
St. Louis
$740 Roundtrip, found 4 days ago
$740
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Mon, Oct 13, priced at $740 found 4 days ago
American Airlines
Fri, Oct 10 - Mon, Oct 13
HMO
Hermosillo
STL
St. Louis
$779 Roundtrip, found 4 days ago
$779
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Mon, Oct 13, priced at $779 found 4 days ago
American Airlines
Fri, Oct 10 - Mon, Oct 13
HMO
Hermosillo
STL
St. Louis
$795 Roundtrip, found 4 days ago
$795
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Mon, Oct 13, priced at $795 found 4 days ago
American Airlines
Sat, Oct 4 - Tue, Oct 7
HMO
Hermosillo
STL
St. Louis
$853 Roundtrip, found 4 days ago
$853
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Oct 4 from Hermosillo to St. Louis, returning Tue, Oct 7, priced at $853 found 4 days ago
American Airlines
Fri, Oct 10 - Mon, Oct 13
HMO
Hermosillo
STL
St. Louis
$863 Roundtrip, found 4 days ago
$863
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Mon, Oct 13, priced at $863 found 4 days ago
American Airlines
Fri, Oct 10 - Mon, Oct 13
HMO
Hermosillo
STL
St. Louis
$879 Roundtrip, found 4 days ago
$879
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Mon, Oct 13, priced at $879 found 4 days ago
American Airlines
Fri, Oct 10 - Mon, Oct 13
HMO
Hermosillo
STL
St. Louis
$880 Roundtrip, found 4 days ago
$880
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Mon, Oct 13, priced at $880 found 4 days ago
Aeromexico
Fri, Oct 10 - Tue, Oct 14
HMO
Hermosillo
STL
St. Louis
$882 Roundtrip, found 4 days ago
$882
Roundtrip
found 4 days ago
Select Aeromexico flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Tue, Oct 14, priced at $882 found 4 days ago
Delta
Fri, Oct 10 - Tue, Oct 14
HMO
Hermosillo
STL
St. Louis
$964 Roundtrip, found 4 days ago
$964
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Oct 10 from Hermosillo to St. Louis, returning Tue, Oct 14, priced at $964 found 4 days ago

Frequently asked questions

How much does a flight from General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $289 or cheap return flight from $656 from General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL) 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 General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL)?
Planning your getaway for October can help you save, as it's the cheapest month for flights between HMO and STL. You'll usually find the lowest fares during the off-season.
What is the cheapest airline that flies from General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest HMO to STL flight.
How many flights per day from General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL)?
There aren't any daily direct flights from General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL). But you can book flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from HMO to STL?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can change based on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL) route, travel before 3 PM. Departures after this hour have a 22% higher chance of being canceled.**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 General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute fares from HMO to STL are usually more expensive. To secure the best rates, start searching for flights well in advance. That said, if your travel plans are flexible, it's possible to score a cheap fare right before you leave.
Is it cheaper to book a HMO to STL flight and hotel package?
You'll typically save money by booking a HMO to STL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. After selecting your ideal accommodations and flights, consider other add-ons like car rentals, activities and tours.
Can I cancel or change the date of my flight from General Ignacio Pesqueira Garcia Intl. Airport (HMO) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your HMO to STL flight in the last 24 hours, you may be able to cancel or modify it without any 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 further details.

Travel information

Travel information

Origin airport
General Ignacio Pesqueira Garcia Intl.
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$655
Distance
1355 mi

Book with confidence

Book with confidence

Hermosillo to St. Louis Flights

The cheapest times to fly from Hermosillo to St. Louis

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 Hermosillo to St. Louis are during the month of October. You can find some of the cheapest flights from Hermosillo to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Hermosillo to St. Louis: 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 Hermosillo to St. Louis

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 Hermosillo to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $289 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 Hermosillo to St. Louis 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 Hermosillo to St. Louis 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.

 

Hermosillo to St. Louis Flights

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*Available to One Key members.