Frontier Airlines Flight 91 Deals & Information (2025/2026)

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Frontier Airlines Flight 91 Route Deals From $107

The cheapest prices found with in the last 7 days for return flights were $222 and $107 for one-way flights to Cancun Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jul 29 - Sun, Aug 3
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$222 Roundtrip, just found
$222
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Jul 29 from Philadelphia Intl. to Cancun Intl., returning Sun, Aug 3, priced at $222 just found
Tue, Jul 29 - Sun, Aug 3
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$236 Roundtrip, just found
$236
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Jul 29 from Philadelphia Intl. to Cancun Intl., returning Sun, Aug 3, priced at $236 just found
Sat, Jul 26 - Tue, Jul 29
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$238 Roundtrip, just found
$238
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Jul 26 from Philadelphia Intl. to Cancun Intl., returning Tue, Jul 29, priced at $238 just found
Sun, Aug 10 - Thu, Aug 14
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$240 Roundtrip, found 1 hour ago
$240
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sun, Aug 10 from Philadelphia Intl. to Cancun Intl., returning Thu, Aug 14, priced at $240 found 1 hour ago
Thu, Aug 14 - Mon, Aug 18
TTN
Mercer
CUN
Cancun Intl.
$366 Roundtrip, found 5 days ago
$366
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Mon, Aug 18, priced at $366 found 5 days ago
Thu, Aug 14 - Mon, Aug 18
TTN
Mercer
CUN
Cancun Intl.
$371 Roundtrip, found 5 days ago
$371
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Mon, Aug 18, priced at $371 found 5 days ago
Thu, Aug 14 - Thu, Aug 21
TTN
Mercer
CUN
Cancun Intl.
$375 Roundtrip, found 6 days ago
$375
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Thu, Aug 21, priced at $375 found 6 days ago
Thu, Aug 14 - Mon, Aug 18
TTN
Mercer
CUN
Cancun Intl.
$375 Roundtrip, found 6 days ago
$375
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Mon, Aug 18, priced at $375 found 6 days ago
Sat, Oct 18 - Sat, Oct 25
TTN
Mercer
CUN
Cancun Intl.
$381 Roundtrip, found 17 hours ago
$381
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Sat, Oct 18 from Mercer to Cancun Intl., returning Sat, Oct 25, priced at $381 found 17 hours ago
Thu, Jul 31 - Sat, Aug 2
TTN
Mercer
CUN
Cancun Intl.
$382 Roundtrip, found 2 days ago
$382
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Jul 31 from Mercer to Cancun Intl., returning Sat, Aug 2, priced at $382 found 2 days ago

Frequently asked questions

What route does flight number F991 take?
Flight number F991 operates directly from Philadelphia Airport to Cancun Intl. Airport (CUN). During this trip, expect to be in the air for about 4 hours. It's wise to book ahead to secure your preferred seat.
What terminal does F991 fly out of?
You'll likely be jetting out of Terminal E if you're flying on F991 direct from Philadelphia Intl. Airport (PHL) to Cancun Airport.
What kind of plane is on flight number F991?
There's every chance you'll find yourself jumping on board an Airbus A320 if you're traveling on flight number F991. Generally, this flight departs from Philadelphia Airport and comes in to land at Cancun Airport.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your F991 flight with Travelocity, please visit our Customer Service Portal.