The cheapest times to fly from STL to HMO are

  • January 22nd to March 4th (except the week of February 5th)
  • April 16th to April 29th
  • July 9th to November 11th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from STL to HMO is mid to late August. Prices can be as high as $2484 for Friday flights during late December, or as low as $387 for Wednesday flights around mid to late August.


When to Fly to Hermosillo

Flying from St. Louis, MO (STL) to Hermosillo (HMO) will usually cost between $428 to $958 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late August with an average ticket price of $428. Due to high demand the most expensive time to fly is late December, with an average price of $1083. Planning your trip to low-cost times can easily save you $655 on economy flights and even more on first-class flights. Generally, any price below $564 can be considered a good price for a round-trip STL to HMO flight.

See below for a graph of average weekly prices for the STL to HMO route. All prices are for round-trip tickets in USD.

STL to HMO Flight Prices

Compared to other flights, the STL to HMO flight is cheaper than the average and costs less than the average flight leaving from St. Louis. The average price per mile (for a direct flight) is $0.26, which is below average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to depart and return on this flight. Fridays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $315 (40%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Wednesday and returning a week later will cost an average of $469. Return trip prices are from the HMO to STL flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from STL to HMO can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 3 hour 25 minutes may not be realistic.


Flight Hacking STL to HMO

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from STL to HMO — but Champion Traveler does!

Hack #1: Mexico City (STL > MEX > HMO)

  • Price for both tickets: $473
  • Average savings: $92 (16.22%)

See STL to MEX flights


Flight Questions Answered

Still have questions about flying from STL to HMO? We’ve got answers.

Which airlines fly this route?

You can find 5 major airlines flying this route most often: Aeromexico, Alaska, American, Delta, United, and potentially more during busy seasons.

How far away is it from General Ignacio P. Garcia International Airport to St Louis Lambert International Airport?

The distance between the two airports is roughly 1356 miles or 2182 kilometers.

How long does it take to fly from STL to HMO?

The real-world flight time for a nonstop STL to HMO flight is about 3 hour 25 minutes.

How many flights go between St. Louis, MO and Hermosillo?

It depends on the day of the week and the date, but a typical day might have around 42 available flights from STL to HMO.


Airport Location Info


Departing Airport

Origination code STL
Origination airport name St Louis Lambert International Airport
City St. Louis, MO
Country the United States
Latitude 38.7
Longitude -90.4

Return Airport

Destination code HMO
Destination airport name General Ignacio P. Garcia International Airport
City Hermosillo
Country Mexico
Latitude 29.1
Longitude -111.1


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.