Headline fares rarely tell you which budget airline is actually cheapest. This guide gives you a simple way to compare Ryanair, easyJet, and Jet2 after the extra costs that usually change the final total: cabin bag rules, checked baggage, seat selection, airport choice, and a few booking decisions that are easy to overlook. Instead of chasing one-off prices, you can use the same method each time you compare flights from UK airports and make a cleaner like-for-like decision.
Overview
If you are trying to compare low cost airlines in the UK, the biggest mistake is to compare only the first fare shown in search results. For a true hidden flight fees comparison, you need to price the trip you will actually take, not the stripped-back version the airline advertises first.
That is why the answer to Ryanair vs easyJet vs Jet2 is usually: it depends on what you are bringing, where you are flying from, and whether you care where you sit. One airline may look cheapest for a solo traveller with one small under-seat bag. Another may work out better for a couple sharing checked luggage. A third may become better value for a family because of how the fare structure fits school-holiday travel, seating needs, or route convenience.
The most useful way to think about the cheapest budget airline after fees is to break total trip cost into five parts:
- Base fare: the headline ticket price for the dates and route.
- Baggage cost: small cabin bag, larger cabin bag, checked bag, and any route-specific or timing-related differences.
- Seat cost: optional if you do not mind random allocation, but often effectively necessary for families, groups, or travellers who want extra legroom.
- Airport and transport cost: a cheaper fare from a less convenient airport can become more expensive once rail, coach, parking, or overnight stay costs are added.
- Flexibility cost: if your plans might change, the cheapest fare may not be the cheapest real-world option once change fees or fare differences are considered.
This article is designed as an evergreen comparison tool rather than a snapshot ranking. Airline baggage fees UK travellers pay can change, routes come and go, and fare patterns move with seasonality. The method below is what matters. Once you use it a few times, comparing budget flights from UK airports becomes much faster and more realistic.
For route-specific planning, it also helps to pair airline comparisons with airport and destination guides. If you are weighing departure options, see Cheap Flights From London Airports: Heathrow vs Gatwick vs Stansted vs Luton, Cheap Flights From Manchester Airport: Best Destinations and Deal Patterns, or Cheap Flights From Edinburgh Airport: Best European and Long-Haul Routes.
How to estimate
Here is the simplest repeatable formula for comparing Ryanair, easyJet, and Jet2 on a like-for-like basis:
Total trip cost = fare + baggage + seats + airport transfer/parking + booking extras you actually need
The key phrase is you actually need. Many travellers overpay by adding extras automatically. Others under-compare by ignoring extras they will inevitably buy later.
Step 1: Start with the same journey
Compare the same route, same travel dates, same number of passengers, and as close to the same departure times as possible. A very early morning flight may have a lower fare, but if it forces a taxi instead of a train, the difference matters. Likewise, a late-night return can mean extra airport parking or a hotel.
Step 2: Build your real baggage profile
This is usually where the comparison changes most. Before you look at prices, decide which of these profiles fits you:
- Light traveller: one small under-seat bag only.
- Weekend traveller: one cabin bag plus small personal item if included.
- Holiday traveller: one checked bag.
- Couple sharing luggage: one checked bag between two.
- Family traveller: checked bags, pram needs, or a stronger chance of paying for assigned seats.
If you compare airlines using the wrong baggage profile, your result will be wrong even if the headline fare comparison is technically accurate.
Step 3: Decide whether seat selection is optional or necessary
For some travellers, random allocation is fine. For others, it is not. If you are travelling with children, want to sit together, need to be near the front for a tight arrival schedule, or simply dislike uncertainty, then seat selection should be counted as part of the trip cost.
One of the most common errors in a budget airline baggage fees UK comparison is counting bag fees but ignoring seat fees. In practice, many passengers buy both.
Step 4: Add airport access costs
This matters more than many people expect. A flight from a secondary airport might save money on paper but cost more once you factor in:
- train or coach fares
- fuel or airport parking
- drop-off fees
- extra travel time
- overnight accommodation for awkward schedules
For example, if you are comparing cheap flights from London, airport choice can be as important as airline choice. The same principle applies outside the capital. Our guides to cheap flights from Birmingham Airport and cheap flights from Manchester Airport can help you judge whether a nearby departure point may save money overall.
Step 5: Check what happens if plans change
If the trip is fixed, flexibility may not matter. But if you are booking around work, family plans, or weather-sensitive travel, a very low fare can become expensive if changes are likely. You do not need to assign an exact number in every case. It is enough to ask: if I need to move this booking, which option would be least painful?
Step 6: Compare the final total, not the teaser fare
Once you add realistic extras, sort the options by final total cost. Then make one final check: is the cheapest option still worth it after considering departure airport, timing, and convenience? Sometimes the answer is yes. Sometimes paying slightly more saves hours of hassle.
Inputs and assumptions
To make this article useful over time, it helps to compare airlines using standard inputs rather than trying to pin down temporary fares. Below are the assumptions that tend to matter most.
1. Fare type matters more than the advertised lead-in price
Low-cost carriers are designed around unbundled pricing. That means the starting fare is only one component. When you compare Ryanair, easyJet, and Jet2, think in terms of fare structure, not just fare amount. Ask:
- What does the basic fare include?
- How much do I need to add to make this ticket usable for my trip?
- Am I likely to add extras during booking anyway?
If the answer to that last question is yes, include them from the start.
2. Cabin baggage is often the decisive variable
Many travellers search as if they are taking only a small bag, then realise later they need more space. That single change can reverse the airline ranking. If you routinely pack for a city break with more than one pair of shoes, a laptop, or cold-weather layers, assume you need the baggage allowance you normally use rather than the most optimistic version of yourself.
This is particularly relevant for city break flights where short durations can make travellers underestimate luggage needs. If you are planning a short European trip, our guides to cheap flights to Amsterdam from the UK and cheap flights from Bristol to Barcelona are good examples of routes where baggage choices can shift the best-value airline.
3. Seat fees are partly a comfort decision and partly a risk decision
A seat is not just about legroom or window views. It can also be about reducing friction. If sitting apart would bother you, then assigned seating is not really optional. Treat it as part of the core cost.
For solo travellers on short flights, skipping seat selection may be reasonable. For families and pairs on holiday flights, counting it often gives a more honest comparison.
4. Nearby airport comparisons should include ground travel
Some of the best-looking cheap flight deals disappear once surface transport is included. A lower base fare can be cancelled out by expensive rail tickets, airport parking, or infrequent return transport. This is why a strong flight comparison site UK workflow should always include airport access costs, not just airfare.
If you are planning winter sun or a longer leisure trip, this matters even more. A route that looks cheaper from one airport may become less attractive if it adds a difficult departure time or extra parking days. See our guides to cheap flights to Tenerife from the UK, cheap flights to Malaga from the UK, and cheap flights to Dubai from the UK for examples of how airport choice and travel season can shape value.
5. The cheapest airline may differ by trip type
It helps to separate your comparisons into scenarios:
- One-bag weekend break: headline fare often matters most.
- Long weekend with cabin bag: baggage rules become central.
- One-week holiday: checked baggage and airport convenience matter more.
- Family trip: seat selection and total baggage planning become more important.
- Peak-season booking: schedule reliability and route availability may matter as much as price.
That is why there is no single evergreen winner in a compare low cost airlines UK article. The best choice depends on your actual use case.
6. Time has a cost too
If one itinerary saves a small amount but adds a much earlier start, a longer transfer, or a remote airport, that trade-off should be acknowledged. Not every comparison needs a formal money value for time, but you should at least note whether the cheapest option is also the least convenient.
Worked examples
The examples below use illustrative scenarios rather than live fares. The point is to show how to think, not to claim that one airline is always cheaper.
Example 1: Solo traveller on a two-night city break
You are flying from a London-area airport to a European city for two nights. You can travel with one small bag and you do not care where you sit.
Best comparison method: look first at final fare with no extras, then add airport transfer costs.
What usually decides it: the airline with the cheapest true basic fare on your chosen dates, unless it departs from an airport that is more expensive or difficult for you to reach.
What to watch: if you end up needing a larger cabin bag, the ranking may change immediately.
Example 2: Couple on a four-night break sharing one checked bag
You are flying from Manchester or Birmingham for a European break. You want one checked bag between two people and would prefer to sit together.
Best comparison method: build the total from fare + one shared checked bag + two seat assignments + airport access.
What usually decides it: not the cheapest lead fare, but the airline whose add-ons for your exact setup are least punitive.
What to watch: if one carrier operates from a more convenient airport or has better flight times, a slightly higher total can still be better value.
Example 3: Family holiday during a busy period
You are booking school-holiday flights with children, likely with multiple bags, and random seating is not attractive.
Best comparison method: ignore teaser prices and compare only fully loaded totals.
What usually decides it: route availability, practical flight times, the number of bags needed, and the cost of sitting together.
What to watch: if one airline requires less compromise on times or airport choice, that can matter more than a small fare difference.
Example 4: Winter sun trip with longer stay
You are taking a one-week or two-week escape and checked baggage is highly likely.
Best comparison method: compare total cost alongside departure airport convenience, especially if parking or rail fares are involved.
What usually decides it: the full travel package cost, including how easy the airport is to use.
What to watch: a cheaper flight from a less convenient airport can stop being cheaper once the trip length increases your parking or transfer bill.
A simple scorecard you can reuse
When you next compare Ryanair, easyJet, and Jet2, use a short scorecard like this:
- Fare: lowest / middle / highest
- Bags for my trip: lowest / middle / highest
- Seats for my trip: needed or not needed
- Airport access: easy / acceptable / inconvenient
- Schedule: good / workable / awkward
- Total: best value / cheapest on paper / not worth the trade-off
This kind of repeatable comparison is more useful than trying to remember which airline seemed cheaper last time. Budget airline value changes with route, season, and trip style.
When to recalculate
You should revisit this comparison any time one of the inputs changes. That is the real evergreen lesson: do not assume the winner stays the same.
Recalculate when:
- you switch from small-bag-only to cabin bag or checked bag travel
- you move from solo travel to a couple or family booking
- your departure airport changes
- flight times become more awkward and ground transport costs rise
- you travel in school holidays or another peak period
- you start caring about seat selection or flexibility
- airline fee structures, route availability, or baggage policies are updated
A practical habit is to save your preferred comparison template in a notes app or spreadsheet. Keep one row for each airline and columns for fare, bag costs, seats, airport transfer, and total. Then every time you search for flight deals UK, you can rebuild the comparison in a few minutes instead of starting from scratch.
For readers following specific routes, this is also where fare alerts help. If you monitor a route over time, you can compare not only headline fares but the full trip cost as soon as prices move. That is especially helpful for popular short-haul leisure destinations and departure hubs covered elsewhere on Scanflights.
The final rule is simple: book the cheapest complete trip, not the cheapest advertised seat. In many cases that will still be one of the big low-cost carriers. But the real winner is the option that matches your baggage, seating, airport, and schedule needs with the lowest realistic total.
If you keep that framework in mind, you will make better decisions across everything from short European hops to longer leisure trips. And if you are extending your planning beyond short-haul, you may also want to compare destination-specific deal patterns such as cheap flights to New York from the UK or cheap flights to Dubai from the UK, where the same principle applies: the best fare is the one that stays best after the real trip costs are included.
